find the value of `cos^2theta/2-sin^2theta/2=?`

If cot theta=(1)/(sqrt(3)), find the value of (1-cos^(2)theta)/(2-sin^(2)theta)

If 2cos(theta)+sin(theta)=1 and (3 pi)/(2)

If 3cot theta=4, find the value of (4cos theta-sin theta)/(2cos theta+sin theta)

If 3tan theta=4, find the value of (4cos theta-sin theta)/(2cos theta+sin theta)

If sin theta=12/13 find the value of (sin^2 theta-cos^2 theta)/(2sin theta cos theta)xx1/(tan^2 theta)

If sin theta=(12)/(13), find the value of (sin^(2)theta-cos^(2)theta)/(2sin theta cos theta)xx(1)/(tan^(2)theta)

If cos theta=(5)/(13), find the value of (sin^(2)theta-cos^(2)theta)/(2sin theta cos theta)xx(1)/(tan^(2)theta)

If sqrt(3)sin theta=cos theta, find the value of (3cos^(2)theta+2cos theta)/(3cos theta+2)

If costheta+cos^(2)theta=1 , then find the value of sin^(4)theta+sin^(2)theta .

If sintheta+sin^(2)theta=1 , then find the value of cos^(2)theta+cos^(4)theta .