Question

Fie a ∈ ( $0, \frac{ \pi }{2}$ ), b ∈ $( \frac{ \pi }{2} , \pi )$. Stiind ca sin a = $\frac{1}{2}$, sin b = $\frac{2}{3}$ sa se calculeze sin(a+b), cos (a-b), tg(a+b)

Answer 1

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