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

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

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

myininaya
 one year ago
Best ResponseYou've already chosen the best response.2Recall 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): \[\cos^2(\alpha)=\frac{1}{2}(1+\cos(2 \alpha))\]

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