If A is an acute angle and cosA is=12/13,verify that sinA(1-tanA)=35/156
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Cos A=12/13
Base =12xand Hypotenuse =13x...so by pythagoras theorem... Perpendicular =5x
SinA(1-tanA)
P/H(1-P/B)
5/13(1-5/12)
5/13((12-5)/12)
5/13(7/12)
=(5*7)/(13*12)
Hence 35/156
HOPE YOU UNDERSTOOD!!!
Base =12xand Hypotenuse =13x...so by pythagoras theorem... Perpendicular =5x
SinA(1-tanA)
P/H(1-P/B)
5/13(1-5/12)
5/13((12-5)/12)
5/13(7/12)
=(5*7)/(13*12)
Hence 35/156
HOPE YOU UNDERSTOOD!!!
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