Find the range of `f(theta)=5costheta+3cos(theta+pi/3)+3`

The range of f(theta)=3cos^2theta-8sqrt(3) cos theta sin theta + 5 sin^2theta-7 is gven by

Write the interval in which the values of 5costheta+3cos(theta+pi/3)+3\ lie.

For all values of theta,3-costheta+cos(theta+(pi)/(3)) lie in the interval

Solve: cos3theta+costheta=0

For theta>pi/3 , the value of f(theta)=sec^2theta+cos^2theta always lies in the interval

If sin theta_1 + sintheta_2 + sin theta_3 = 3 then find the value of cos theta_1 + cos theta_2 + cos theta_3.

Prove that the value of 5 costheta+3 cos(theta+pi/3) lies between -7 and 7.

If tan theta=-3/4 and pi/2 < theta < pi, find the values of sin theta,cos theta and cot theta .

Solve: cos3theta+2costheta=0

If theta in R - {(4n + 1) pi/4 , n in I} , then range of (cos 3 theta + sin 3 theta)/(cos theta - sin theta) is :