Math, asked by ahemadtafheem, 10 months ago

sin 20 (3- 4cos^2 70)

Answers

Answered by sprao53413

2

Answer:

=cos 70(3-4cos^2 70)

=3cos70-4co^3 70

Cos3(70)=cos 210=cos(180+30)=-cos30= - v3 /2

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