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| physics chemistry maths science forums |
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![[Post New]](/templates/default/images/icon_minipost_new.gif) 20 Feb 2008 22:28:51 IST
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find period of cos(cos x)+cos(sin x)
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Pi/2
replacing x as x+pi/2
we get cos(cos(pi/2+x))+ cos(sin(pi/2+x))
cos(-sinx)+cos(cosx)
cos(sinx)+cos(cosx)
same as given
so period is pi/2
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