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(1-tanα)/(1+tanα)=(1-sinα/cosα)/(1+sinα/cosα)=((cosα-sinα)/cosα)/((cosα+sinα)/cosα)=(cosα-sinα)/(cosα+sinα)=((cosα-sinα)*(cosα-sinα))/((cosα+sinα)(cosα-sinα))=(cosα*cosα…
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