State the signs of cos`4^c` and cos`4^@`.Which of these two functions is greater?

State the signs of cos (frac(-8pi)(3))^2

What is the function of CO-A?

State the effects of CO on human body.

Prove that sin^4 theta - cos^4 theta = 1 - 2cos^2 theta

State the quadrant in which theta lies if cos theta 0

Express the following as a sum or difference of two trignometric functions, 2cos4theta cos2theta

The vlaue of 1/8(3-4cos 2 theta + cos 4 theta) is

Express the following as a sum or difference of two trignometric functions, 2cos35^@cos75^@

Verify Rolle's theorem for each of the following functions : f(x) = e^(-x) (sin x - cos x) " in " [(pi)/(4), (5pi)/(4)]