In this problem, please evaluate the trig functions without a calculator and do not use a decimal point in your answer.

An equation of the tangent line to the curve $y = \sin (x)$ at $x = \pi/3 \,$ is
$y =$ $+$ $\cdot (x - \pi/3)$ .

An equation of the tangent line to the curve $y = \cos (x)$ at $x = 3\pi/2 \,$ is
$y =$ $+$ $\cdot (x - 3\pi/2)$ .