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ashowthatcseco-tane- - singItsino |
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Answer» 1 - sinx/ 1+ sinx , 1- sinx / 1 + sinx × 1-sinx/ 1- sinx= (1- sinx)^2/(1+sinx)( 1- sinx)= ( 1 + sinx^2 -2sinx)/ 1 - sinx^2= (1 + sinx^2 -2 sinx)/ cosx^2 = 1/ cosx^2 + sinx^2/ cosx^2 -2sinx/ cosx^2 = secx^2 + tanx^2-2secxtanx = ( secx - tanx)^2 |
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