Question

,if sin a =1/2 and a is an acute angle ,than find value of (3 cos a-4 square cos square 3 a.)​

Answer 1

Step-by-step explanation:

sin a= 1/2

sin a= sin 30°

a=30°

3cos a- 4^2 cos ^2 3a

3cos 30° - 16 cos^2 90°

3×√3/2-16 × 0° ( since cos 90°=0)

3√3/2

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