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Prove that 5cosx + 3cos (x+ 60) +3 lies between -4 and 10.

Prove that 5cosx + 3cos (x+ 60) +3 lies between -4 and 10.

Grade:10

1 Answers

Kaustubh
20 Points
4 years ago
5cosx+3cos(x+60)+35cosx+3(cosx.cos60-sinxsin60)+35cosx+3(cosx/2-3^1/2 /2sinx) +313/2cos-.........Using trigo formula for max and min-(A+b)1/2

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