Math, asked by ShaniKat1439, 9 months ago

If sin b= 1/2 find 3 cos b- 4 cos^3b

Answers

Answered by devansmakam

1

Answer:

sin b=1/2 then b is 30°

3cos b-4cos^3b=cos 3b. ( identy)

cos 3(30)

cos 90

= 0

:- 3cosb-4cos^3b= o

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