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Svar 5.1:4

a)	\sin^2 x+\cos x
b)	\cos v=\cos\displaystyle\frac{3\pi}{2}
c)	\cot 2x=\displaystyle\frac{1}{\tan 2x}
d)	\tan\displaystyle\frac{u}{2}=\displaystyle\frac{\sin u}{1+\cos u}