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a)

$\sin390°=\sin30°=\frac{1}{2}$

b)

$\sin\left(-\frac{\pi}{4}\right)=\sin\ \frac{7\pi}{4}=\frac{-\sqrt{2}}{2}$

c)

$\cos2020\pi=\cos0=1$

d)

$\sin\ \frac{14\pi}{3}=\sin\ \frac{2\pi}{3}=\frac{\sqrt{3}}{2}$

e)

$\cos\ \frac{11\pi}{4}=\cos\ \frac{3\pi}{4}=\frac{-\sqrt{2}}{2}$

f)

$\cos\ \frac{29\pi}{6}=\frac{5\pi}{6}=\frac{-\sqrt{3}}{2}$