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 (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 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
If `sin(theta+alpha)=aa n dsin(theta+beta)=b ,` prove that `cos2(alpha-beta)-4a bcos(alpha-beta)... If `sin(theta+alpha)=aa n dsin(theta+beta)=b ,` prove that `cos2(alpha-beta)-4a bcos(alpha-beta)...
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