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amrmagdyBest ResponseYou've already chosen the best response.1
use double angles rules
 10 months ago

amrmagdyBest ResponseYou've already chosen the best response.1
cos2x=2cosx1 .. did you get it ?
 10 months ago

chikaaBest ResponseYou've already chosen the best response.0
and what about the cos^2
 10 months ago

myininayaBest ResponseYou've already chosen the best response.2
Recall the double angle identity for cosine. \[\cos(2 \alpha )=\cos^2(\alpha)\sin^2(\alpha)=\cos^2(\alpha)(1\cos^2(\alpha))\] \[\cos(2 \alpha)=\cos^2(\alpha)1+\cos^2(\alpha)\] \[\cos(2 \alpha)=2 \cos^2(\alpha)1\] Solve this equation for cos^2(alpha): \[\cos^2(\alpha)=\frac{1}{2}(1+\cos(2 \alpha))\]
 10 months ago

chikaaBest ResponseYou've already chosen the best response.0
Thank you Amrmagdy and Myininaya :D
 10 months ago
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