Prove that 5cosx + 3cos (x+ 60) +3 lies between -4 and 10.
Kshitij , 8 Years ago
Grade 10
Trigonometry> Prove that 5cosx + 3cos (x+ 60) +3 lies b...
1 AnswersKaustubh
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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