упростите выражение:
а)sin(α+β)-sinα cosβ
б)sin ([tex] \frac{ \pi }{3} [/tex]+α) ₋ [tex] \frac{1}{2} [/tex]sin α
в) sinα sinβ+cos(α+β)
г)cos(α+[tex] \frac{ \pi }{4} [/tex])+[tex] \frac{ \sqrt{2} }{2} [/tex] sinα

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