TanA= ntanb, sinA =mSinb then prove that cos²A = m²-1/n²-1
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9
look at this picture.....
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Answered by
6
may I say u the most simplest method
and here it is
https://hi-static.z-dn.net/files/d3a/dfa326b5e7c19add6ae4a46a7fd72749.jpg
and here it is
https://hi-static.z-dn.net/files/d3a/dfa326b5e7c19add6ae4a46a7fd72749.jpg
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