What is the derivative of $cos (π \cdot \frac{t}{6})$ $cos(pi*t/6)$ ?

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Answer 1 · 2017-01-08T12:27:42

$- \frac{π}{6} sin (\frac{π}{6} t)$ $-pi/6sin(pi/6t)$

The variable is t, then

$f'(t)=-sin(pi/6t)*pi/6$

that's

$-pi/6sin(pi/6t)$

What is the derivative of cos(pi*t/6)cos(π⋅t6) cos(pi*t/6)?