Question

Помогите ! как это делать ? 

 

10sin 5π/4 cos 7π/4 ctg 3π/4

Answer 1

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10sin5pi/4 cos7pi/4 ctg3pi/4   =  10sin(pi  +  pi/4) cos(2pi  -  pi/4)ctg(pi  -  pi/4)  =

 

10*(-V2/2)*V2/2*(-1)   =  5