Let a= 1. b= SinA
given from question
(a + b)². - ( a-b)²
= a² +b²+2ab -( a² + b² -2ab)
= 2ab + 2ab = 4ab
Substituting values of a and b
4 x 1 xSinA = 4SinA = RHS
Author:
gringozsg7
Rate an answer:
10Answer:
Let a= 1. b= SinA
given from question
(a + b)². - (a-b)²
=a² +b²+2ab-( a² + b² -2ab)
= 2ab + 2ab = 4ab
Substituting values of a and b
4 x 1 xSinA = 4SinA = RHS
Author:
alan239
Rate an answer:
6