Grade 11Trigonometry
Maximum value of cos^3x+cos^3(120+x)+cos^3(120-x)
Maximum value of cos^3x+cos^3(120+x)+cos^3(120-x)
1 Answer
Sher Mohammad
cos^3x+cos^3(120+x)+cos^3(120-x)=f(x)
f'(x)= 3cos2xsinx+3cos2 (x+120)sin(x+120)+
3cos2(x-120)sin(x-120) =0
solve for x to get the maxima
sher mohammad
b.tech, iit delhi
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