## Calculus 10th Edition

The derivative is $\pi/2*cos( theta )+sin(theta)$
Whenever two or more functions are being added or subtracted, the overall derivative would be the sum of the derivatives of every smaller function. The derivative of $\pi/2*sin(theta)$ would be $\pi/2*cos(theta)$ and the derivative of -cos(theta) would be +sin(theta); hence, the overall derivative would $\pi/2*cos( theta )+sin(theta)$.