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If tana 3/4 then cos2a-sin2a

WebWe know that cos2A = (1-tan^2 A)/ (1+Tan^2 A) and sin2A= 2tanA/ (1+tan^2 A). tanA = b/a acos2A+bsin2A =a { (1-tan^2 A)/ (1+tan^2 A)} +b {2tanA/1+tan^2 A) =a {1- (b^2/a^2)}/ {1+ (b^2/a^2)} +b (2b/a)/ {1+ (b^2/a^2)} =a (a^2-b^2)/ (a^2+b^2) + 2b^2 a/ (a^2+b^2) = { {a (a^2-b^2)+2ab^2}/ ( (a^2+b^2) = {a (a^2-b^2+2b^2)/ (a^2+b^2) Web4 nov. 2014 · This is where you use the double angle identity in which: sin2A=2sinA*cosA. The next step is to draw a right triangle in which the sinA is 4/5. From geometry, this …

if 2tanA=3tanB,prove that tan(A-B)=sin2B/5-cos2B - askIITians

WebCorrect answers: 1 question: What is the result of 8 2/8 - 6 5/8 Web3 mrt. 2024 · Best answer. Given. 7sin^2A+3cos^2A=4. =>7sin^2A+3cos^2A=4 (sin^2A+cos^2A) =>3sin^2A=cos^2A. =>sin^2A/cos^2A=1/3. =>tan^2A=1/3. … i need help updating my resume https://makcorals.com

If 7sin²A+3cos²A=4, then prove that tanA=1/√3. - Sarthaks

Web2 sin an sin b product Web9 dec. 2024 · If tan A = 3/4 then sin A =3/5 (from trigonometric functions) cos A = 4/5 Now RHS cos 2 A – sin 2 A = (4/5) 2 – (3/5) 2 = 16/25 – 9/25 = 7/25 Therefore LHS = RHS (1 – tan 2 A)/ (1 + tan 2 A) = cos 2 A – sin 2 A Hence Proved Similar Questions Question 1: What is the exact value of sin 270? Solution: Here sin is positive only in 1st and 2nd Quadrant. WebGet an answer for 'Proving trigonometric identities Prove: sin2A = 2tanA/1 + tan^2A' and find homework help for other Math questions at eNotes i need help with alcoholism

If 3 A=4, then find cos 2 A sin 2 A - Byju

Category:If TanA=b/a, can you show that a cos2A+b sin2A=a? - Quora

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If tana 3/4 then cos2a-sin2a

已知tana=-4/3,则sin2a=. - 雨露学习互助

Web30 mrt. 2024 · If tan A = 3/4, find the value of 1/sinA + 1/cosA [with Video] - Teach. Class 10. Solutions of Sample Papers for Class 10 Boards. CBSE Class 10 Sample Paper for … WebHardest sum of trigonometry class 10 - Trigonometry Problems - sin, cos, tan, cot: Very Difficult Problems with Solutions t2x+ t2y+ tg2z= t2xcot2ycot2z.

If tana 3/4 then cos2a-sin2a

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Web17 aug. 2011 · tan (2A) = (2tanA) ÷ (1 - tan²A) So there you have the 3 double angle trigonometric identities: sin (2A) = 2sinAcosA cos (2A) = cos²A - sin²A = 1 – 2sin²A = 2cos²A – 1 tan (2A) = (2tanA) ÷ (1 - tan²A) Just remember there are 3 version of the double angle cosine formula. For more help on the trigonometric addition and difference formula click … WebExplanation for the correct option: Step 1: Given that, ∴ tan A 2 = 3 2 We know that, cos 2 θ = 2 cos 2 θ - 1 Step 2: Use this formula cos 2 θ = 1 - 2 sin 2 θ ∴ 1 + cos A 1 - cos A = 2 cos 2 A 2 2 sin 2 A 2 = c o t 2 A 2 = 1 tan 2 A 2 = 2 3 2 = 4 9 Therefore, the value of 1 + cos A 1 - cos A = 4 9 Hence, the correct option is (D).

WebUntitled - Free download as PDF File (.pdf), Text File (.txt) or read online for free. WebSin A=0.75=3/4, that is, the front length is 3 and hypotenuse is 4. Cos A is obtained by side length/hypotenuse, but we don’t know the side length yet, fortunately, we’ve known the …

Web26 feb. 2024 · if sinA=3/5 find value of sin2A, cos2A, tan2A, tan4A 1,424 views Feb 26, 2024 15 Dislike Share Save Ford Tech 2.11K subscribers Subscribe #math sinA = 3/5 … Web2 dec. 2015 · Explanation: Use the trig identity: tan2A = 2tanA 1 − tan2A (1). First, find tanA = sinA cosA. sinA = 3 5 --> sin2A = 9 25 --> cos2A = 1 − 9 25 = 15 25 -. --> cosA = ± 4 5. Because A is in Quadrant II, its cos is negative. cosA = − 4 5. tanA = sinA cosA = (3 5)( − 5 4) = − 3 4. Replace value of tan A = -3/4 into identity (1) -->.

Web30 mrt. 2024 · Tính sin2a, cos2a, tan2a biết. Xem lời giải. Câu hỏi trong đề: Giải toán 10: Phần Đại số: Chương 6: Cung và góc lượng giác - Công thức lượng giác !! ... + Giáo án, powerpoint lớp 3, 7, 10 Kết nối tri thức, Cánh diều, ...

WebIf sin α = 3 4, then cos α is - Q8. If the length of a shadow cast by a pole is √3 times the length of the pole, then the angle of elevation of the sun is - Q9. A tower stands vertically on the ground. From a point on the ground 20 m away from the foot of the tower, the angle of elevation of the top of the tower is 60° then height of the tower is login scholarship owlWebCorrect answers: 2 question: A store owner wants to develop a new snack mix by mixing chocolate and trail mix. How many pounds of chocolate costing $13.80 per pound should be mixed with 19 pounds of trail mix costing $4.00 per pound to create a mixture worth $7.98 per pound. The owner needs to mix pounds of chocolate (round to the nearest whole … log in scholar packWeb4 sep. 2024 · 7 sin²A + 3 cos²A = 4 4 sin²A + 3 sin²A + 3 cos²A = 4 3 sin²A + 3 cos²A = 4 - 4 sin²A 3 ( sin²A + cos²A ) = 4 ( 1 - sin²A ) 3 ( 1 ) = 4 ( cos²A ) 3 = 4 × cos²A Hence, tanA = … login scholarship americaWeb29 mrt. 2024 · Ex 8.1, 8 If 3 cot A = 4, check whether ( (1 − 𝑡𝑎𝑛2𝐴))/ ( (1 + 𝑡𝑎𝑛2𝐴))= cos2 A – sin2A or not. 3 cot A = 4 cot A = 4/3 So, tan A = 1/cot⁡𝐴 tan A = 1/ ( (4/3) ) tan A = 3/4 (𝑆𝑖𝑑𝑒 𝑜𝑝𝑝𝑜𝑠𝑖𝑡𝑒 ∠𝐴)/ (𝑆𝑖𝑑𝑒 𝑎𝑑𝑗𝑎𝑐𝑒𝑛𝑡 … i need help with anxiety and depressionWeb7 3 7 Q.6(a)61/6 If X = sin 12 + sin + sin , Y = cos 12 + cos + 12 12 12 cos 3 then prove that X Y = 2 tan2 . i need help with back taxesWebIf tanA=n tanB and sin A =m sin B, ... 1 3. Prove that following identity 855+ Math Experts. 9.3/10 Star Rating 67353 Happy Students ... Difficult Problems with Solutions. Trigonometry Important Questions for Class 10 Maths Question 1. Question 2. If SinA+Sin2A=1 S i n A + S i n 2 A = 1 , then find the value of (cos2A+cos4A) i need help with as a studentWebHow to prove the following equation? \begin{eqnarray} \sin 3A+\cos 3A&=&\left(\cos A-\sin A\right)\left(1+2\sin 2A\right)\\ \end{eqnarray} Let's start with the left ... login scholastic.com.au