The expression `cos^2(alpha+beta)+cos^2(alpha-beta)-cos2alphacos2beta` is

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

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

The expression cos^(2)(alpha+beta)+cos^(2)(alpha-beta)-cos2 alpha*cos2 beta is (a)independent of alpha(b) independent of beta (c)independent of alpha and beta(d) dependent on alphaand beta

cos^(2)(alpha+beta)+cos^(2)(alpha-beta)-cos2alpha cos2beta=

Prove that cos^(2)(alpha-beta)+cos^(2)beta-2cos(alpha-beta)cosalphacosbeta is independent of beta .

f(alpha,beta) = cos^2(alpha)+ cos^2(alpha+beta)- 2 cosalpha cosbeta cos(alpha+beta) is

underset is f(alpha. beta)=cos^(2)+beta cos^(2)(alpha+beta)-2cos alpha cos beta cos(alpha+beta)

If A = cos ^(2) alpha + cos ^2(alpha + beta)- 2 cos alpha cos beta cos (alpha + beta), then

Prove that: cos ^ (2) alpha + cos ^ (2) (alpha + beta) -2cos alpha cos beta cos (alpha + beta) = sin ^ (2) beta

Prove that: cos2alpha\ cos2beta+sin^2(alpha-beta)-sin^2(alpha+beta)=cos2(alpha+beta) .