1.If sin x + sin2x + sin3x= 1, then
cos6x-4cos4x+8cos2x =
(a) 2
(b) 1
(c) 3
(d) 4
sheetal MG , 14 Years ago
Grade 11
Trigonometry> Request for a solution in trigonometry...
1 AnswersSAGAR SINGH - IIT DELHI
Dear student,
It's probably not in the spirit of the question but you can just solve that cubic numerically and get sin(x) = 0.5437. Then using cos^2(x) = 1- sin^2(x) you can easily evaluate it.
The answer will be 4.
Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.
All the best.
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