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#1 Re: Exercises » Trigonometry Proofs » 2009-08-15 20:24:00
hey i got ans for 4th ques
;):)
sinA-2sincubeA/2coscubeA-cosA
take sinA common in numerator and cos A in denominator
we get
sinA(1-2sinsquareA)/cosA(2cossquareA-1)
cos2A formula is 1-2sinsquareA and 2cossquareA-1
so they both will get cancelled
we get
sinA/cosA=tanA
hence proved. 
:P:P:
#2 Exercises » trig » 2009-08-15 19:29:13
- yamini
- Replies: 1
please help me solving this question
sinx+siny=3/4 sinx -siny=2/5 then tan(x-y/2)/tan(x+y/2)
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