Question

TRIGONOMETRY , can you solve this plz:(
even if you know one of them,plz help:)​

Answer 1

See below

Explanation:

`(1)/(1-cos A) - (1)/(1+cos A) =2 cosec A cot A \\ \\ </p><p>L. H. S.= (1)/(1-cos A) - (1)/(1+cos A) \\ \\ = (1+cos A - (1 - cos A))/((1-cos A)(1+cos A))\\ \\ </p><p>= (1+cos A - 1 + cos A)/(1-cos^(2) A)\\ \\ </p><p>= (2cos A )/(sin^(2) A)\\ \\ </p><p>=2 .(1)/(sin A).(cos A )/(sin A).\\ \\ = 2.cosec \: A.cot \: A \\ \\ = </p><p>R.H.S`