Answer 5.1:4

From Förberedande kurs i matematik 1

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