Hi Anoop
Our equation is
= (cot A + cosec A) - (cot A - cosec A) (cot A + cosec A)
Notice that (cot A + cosec A) is common
= (cot A + cosec A) - (cot A - cosec A) (cot A + cosec A)
= (cot A + cosec A) [1 - (cot A - cosec A)]
= (cot A + cosec A) [1 - cot A + cosec A]
Please check the video or comment for further clarification.
Written on March 10, 2017, 8:49 p.m.