need help!!

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need help!!

Postby rajas90 » Mon Aug 06, 2012 8:50 pm

Can anyone plz..prove that the max value of
a.cos y + b.cos z
is = a+b
?
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Re: need help!!

Postby 09bec018 » Tue Aug 07, 2012 10:55 pm

its very simple. the max value for cos function is 1. so when y=z=0, function value should be maximum which is equal to a+b.
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