Show that 2 sin2 β 4 cos (α β) sin α sin β cos 2 (α β) = cos 2α

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Show that 2 sin^2 β + 4 cos (α + β) sin α sin β + cos 2 (α + β) = cos 2α #iitjee #maths

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Show that: `2sin^2beta+4cos(alpha+beta)sinalphasinbeta+cos2(alpha+beta)=cos2alpha`

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`2 sin^(2) beta + 4 cos ( alpha + beta) sin alpha. Sinbeta+cos2 ( alpha +beta)=`

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If sin (θ+α)=a and sin (θ+β)=b, then prove that cos 2(α-β)-4 a b cos (α-β)=1-2 a^2-2 b^2

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If sin (θ+α)=a and sin (θ+β)=b, then prove that cos 2(α-β)-4 a b cos (α-β)= 1-2 a^2-2 b^2 [ Hint...

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If sin ^4α+4 cos ^4β+2=4 √(2)sinαcosβ α, β∈[0, π], then cos (α+β)-cos (α-β) is equal to (2019 Mai...

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Prove that : `cos^2 theta + sin^2 theta cos 2 beta = cos^2 beta + sin^2 beta cos 2theta`

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If \( f(\alpha, \beta)=\cos ^{2} \alpha+\sin ^{2} \alpha \cdot \cos...

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[ If cosα+cosβ=0=sinα+sinβ, then prove that cos 2 α+cos 2 β=-2 cos (α+β) .; ...

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trigonometry Class 11 ncerT EXEMPLAR Practise term exams and JEE Mains

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Prove that : `2 sin^2 theta + 4 cos (theta + alpha) sin alpha sin theta + cos 2 (alpha + theta)`

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How to derive cos(2x) in all three forms?

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6#IfCosA+CosB+CosC=0=SinA+SinB+SinC then Cos^2(A)+Cos^2(B)+Cos^2(C)=3/2=Sin^2(A)+Sin^2(B)+Sin^2(C)

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If sin alpha + sin beta =a and cos alpha + cos beta = b, show that cos (alpha + beta)=b^2-a^2b^2+a^2

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If `cos alpha+cos beta=0=sin alpha+sin beta,` then prove that `cos 2 alpha +cos 2 beta =-2 cos

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If tanα=1/7, tanβ=1/3, then cos 2 α is equal to (A) sin 2 β (B) sin 4 β (C) sin 3 β (D) cos 2 β t...

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A line makes angels α, β, γ, δ with the four diagonals of a cube, prove that cos ^2α+cos ^2β+cos ...

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(Formulae of trignometry ) Prove cosAcos2Acos2^2A------------cos2^(n-1)A =sin2^nA/2^n sinA

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If cos (α+β)=4/5 and sin (α-β)=5/13, where α lie between 0 and π/4, find the value of tan 2 α [Hi...

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If cos (α + β) = 0, then sin (α – β) can be reduced to (A) cos β (B) cos 2β (C) sin α (D) sin 2α

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3.a) prove sin²α + sin²β + sin²γ =2 If α, β and γ are angles which line makes with coordinate axes,

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#Trigonometry Q. If cos^4α/cos^2β+sin^4α/sin^2β=1 then show that cos^4β/cos^2α+sin^4β/sin^2α=1

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If a line makes angles alpha beta gamma with the direction of the axes then write the value of sin²∝