[M times cos theta+alpha=N times cos theta-alpha],[" Prove that "M+N tan alpha=M-N cos theta]

If m cos(theta+alpha)=n cos(theta-alpha), then (m-n)cot alpha=

If m cos(theta+alpha)=n cos(theta-alpha), then (m-n)cot alpha=

If sin (theta + alpha ) = cos ( theta + alpha), prove that tan theta =(1- tan alpha )/(1 + tan alpha )

Prove that cos 4theta–cos 4alpha = 8(cos theta-cos alpha)(cos theta+ cos alpha )(cos theta -sin alpha)(cos theta+sin alpha)

If a* cos ( theta + alpha ) = b cos ( theta - alpha ) , " then " ( a+ b) tan theta =

If cos (theta + 2alpha) = m cos theta , prove that : cot alpha = (1+m)/(1-m)tan(theta + alpha) .

If sin ( theta + alpha ) = cos ( theta + alpha ) , then tan theta =

If cos(theta+2 alpha)=m cos theta, show that cot alpha=(1+m)/(1-m)tan(theta+alpha)

If sin(theta+alpha)=n sin(theta-alpha) , prove that cot theta=(n-1)/(n+1) cot alpha .