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Trignometry

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17 Jul 2012 09:16:46 IST

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find value

Engineering Entrance , JEE Main , JEE Advanced , Mathematics , Trigonometry

if tan a=-1:then sin^5a+cos^a=

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Sagar Saxena

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Joined: 8 Oct 2008

Posts: 8064

20 Jul 2012 18:21:51 IST

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hello,

tana=-1

tana=tan(-/4)

a=n-/4 [tana=tanb==>a=n+b]

now,sin5a+cosa==sin5(n-/4)+cos(n-/4)==-1/+1==0answer.

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