# trig..

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ctgx+cosx=1+ctgx*cosx

• trig.. -

LS = cotx + cosx
= cosx/sinx + cosx
= (cosx + cos^2x)/sinx

RS = 1 + cotx(cosx)
= 1 + cosx/sinx(cosx)
= 1 + cos^2x/sinx
= (cosx + cos^2x)/sinx
= LS

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