August 2018 1 229 Report
1. \frac{tanx-senx}{sen ^{3}x } = \frac{secx}{1+cosx}
2.cotФ+tanФ=cotФ.sec ^{2} Ф
3.1- \frac{senx}{cscx}=cos ^{2} x
4.(1+tanx).(1-tanx)=2-sec ^{2} x

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