cos4 alpha=1-8cos^(2)alpha+8cos^(4)alpha

(cos2 alpha)/(cos^(4)alpha-sin^(4)alpha)-(cos^(4)alpha+sin^(4)alpha)/(2-sin^(2)2 alpha)=

If 2sec^(2)alpha-sec^(4)alpha-2cos ec^(2)alpha+cos ec^(4)alpha=(15)/(4) then tan alpha=

Prove that sin^2alpha-sin^4alpha= cos^2alpha-cos^4alpha

cos^(4)alpha+sin^(4)alpha-6sin^(2)alpha cos^(2)alpha=

If 4sin alpha cos alpha-8sin^(3)alpha cos alpha=(sqrt(3))/(2) and 8cos^(4)alpha-8cos^(2)alpha+1=(-1)/(2), where alpha in(0,(pi)/(2)) Then the value of log_(cos((a)/(2)))((sin alpha+cos alpha)/(sqrt(2))) is equal to

( cos 2 alpha)/( cos^(4) alpha - sin^(4) alpha ) -(cos^(4) alpha + sin^(4) alpha )/(2-sin^(2) 2alpha ) =

Prove that sin^(4) alpha + cos^(4) alpha + 2 sin^(2) alpha cos^(2) alpha = 1 .

cos alpha cos 2 alpha cos 4 alpha cos 8 alpha = (1)/(16), if alpha = 24 ^(@)

If n=1,2,3,......, then cos alpha cos2 alpha cos4 alpha.........cos2^(n-1)alpha is equal to