помогите решить пожалуйста!))). Created by GalyaZelenina. algebra-ru

помогите решить пожалуйста!)))...

GalyaZelenina @GalyaZelenina

August 2021 1 10 Report

помогите решить пожалуйста!)))

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oganesbagoyan

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169cos(3π+β) *sin(7π/2 +β) = - 169cosβ *(-cosβ) =169cos²β =169 *(1/13)² = 1.
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cos(3π+β)*sin(7π/2 +β) =cos(2π+π+β)* sin(4π -(π/2 -β) =cos(π+β) *(-sin(π/2 -β))= = (- cosβ)* (- cosβ) =cos²β.

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