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rodelroberto rodelroberto
  • 03-11-2015
  • Mathematics
Answered

Verify

(2cos2x)/(sin2x) =cotx - tanx

Verified Answer :

crisforp
crisforp crisforp
  • 03-11-2015

cos2x = (cosx)^2 - (sinx)^2;
sin2x = 2sinxcosx;
Then, (2cos2x)/(sin2x) =2[ (cosx)^2 - (sinx)^2 ] / (2sinxcosx) = [ (cosx)^2 - (sinx)^2 ] / (sinxcosx) = (cosx)^2 / (sinxcosx) - (sinx)^2 / (sinxcosx) = cosx/sinx - sinx/cosx = cotx - tanx;

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