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amrmagdy Group TitleBest ResponseYou've already chosen the best response.1
use double angles rules
 one year ago

amrmagdy Group TitleBest ResponseYou've already chosen the best response.1
cos2x=2cosx1 .. did you get it ?
 one year ago

chikaa Group TitleBest ResponseYou've already chosen the best response.0
and what about the cos^2
 one year ago

amrmagdy Group TitleBest ResponseYou've already chosen the best response.1
sry cos2x=2cosx^21
 one year ago

myininaya Group TitleBest 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): \[\cos^2(\alpha)=\frac{1}{2}(1+\cos(2 \alpha))\]
 one year ago

chikaa Group TitleBest ResponseYou've already chosen the best response.0
Thank you Amrmagdy and Myininaya :D
 one year ago
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