if sinx+sin2x=1 then explain how to solvecos2x +cos4x=?
Abhijat Pandey , 13 Years ago
Grade 12
Trigonometry> PLz solve it!...
3 Answers
Godfrey Classic Prince
Last Activity: 13 Years ago
Dear Abhijat Pandey,
cos2x + cos4x =12
I will give my explaination in the other answer shortly ..!
Thank You.
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Bajrangi Baahubali
Last Activity: 9 Years ago
cos^2x+cos^4x=? …...(1)
sinx+sin^2x =1
since, sin^2x+cos^2x=1
therefore, sin^2x=1-cos^2x
hence, sinx+sin^2x becomes sinx+1-cos^2x=1
which concludes sinx=cos^2x …..(2)
similarly, sin^2=cos^4x (by Squaring (2))
on substituting
(2) in (1)
we get sinx+sin^2=cos^2x+cos^4x=1
Akshat
Last Activity: 6 Years ago
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