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The expression cos^(2)(alpha+beta)+cos^(...

The expression `cos^(2)(alpha+beta)+cos^(2)(alpha-beta)-cos2alpha cos2beta`, is

A

`-1`

B

2

C

independent of `alpha` and `beta`

D

dependent on `alpha` and `beta`

Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • If tan alpha and tan beta are the roots of the equation x^(2) +px + q = 0 , then the value of sin^(2) (alpha +beta) + p cos (alpha + beta) sin (alpha + beta) + q cos^(2) (alpha + beta) is

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  • If sin(theta+alpha)=a and sin (theta+ beta) , then cos2(alpha-beta)-4ab cos(alpha -beta) =

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