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icse trignomety ques

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abhas
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PostSubject: icse trignomety ques Thu Dec 13, 2007 10:48 pm

solve this ques
Trigonometry:given that : sin a + cos a=1 hence prove that sin a - cos a= +1

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PostSubject: answer it Thu Dec 13, 2007 11:02 pm

u can answer it at yahoo answer as well click here

affraid

Very Happy register at icse.fairtopic.com if you liked the question to get more such cool questions from its members. Very Happy
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PostSubject: solved Fri Dec 14, 2007 11:40 am


sina cosa=1 --->square both sides
sin^a cos^2a 2sin cosa =1
1 2sina cosa =1
2sina cosa =0
so
(sina -cosa)^2 = sin^2 a cos^2 a -2sina cosa =1 - 0 = 1

so
(sina - cosa)^2 =1
sina -cosa = /-1
so
either
sina - cosa =1
or sina -cosa = -1
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PostSubject: Re: icse trignomety ques

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Complete IIT AIEEE ICSE ISC PMT help forum :: Maths :: Maths Question answer-