Assertion (A) : `cos^2theta+cos^2(6 0^(@)-theta)+cos^2(6 0^(@)+theta)=3/2` Reason (R) : `sin alpha-sin (120^@-alpha)+sin(120^@+alpha)=0`

Assertion (A):cos^(2)theta+cos^(2)(60^(@)-theta)+cos^(2)(60^(@)+theta)=(3)/(2)sin alpha-sin(120^(@)-alpha)+sin(120^(@)+alpha)=0

Assertion (A):cos^(2)theta+cos^(2)(60^(@)-theta)+cos^(2)(60^(@)+theta)=(3)/(2)sin alpha-sin(120^(@)-alpha)+sin(120^(@)+alpha)=0

2(sin^(6) theta + cos^(6)theta) - 3(sin^(4)theta + cos^(4)theta)+ 1 = 0

tan theta = (sin alpha-cos alpha) / (sin alpha + cos alpha)

I : If x cos theta = y cos (120^@ + theta ) = z cos ( theta + 240^(@)) then xy+ yz+ zx=1 II : cos alpha + cos (120^(@) + alpha ) + cos (120^@ - alpha ) =0

cos ( theta + alpha)* cos ( theta - alpha) + sin ( theta + alpha) * sin (theta - alpha )=

The value of expression E=3(sin^(4)theta+cos^(4)theta)-2(sin^(6)theta+cos^(6)theta)+(sin(pi-alpha))/(sin alpha-cos alpha tan((alpha)/(2)))-cos alpha

General term ( sin^2 theta = sin^2 alpha , cos^2 theta = cos^2 alpha, tan^2 theta= tan^2 alpha)

If cos^(3) theta = kcos (alpha- 3 theta) and sin ^(3) theta= ksin (alpha-3 theta) , then show that 2k^(2)-k cos alpha-1=0

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