Question

The statement (sinx + siny)2 > (sinx - siny)2 is
(A) always true
(C) true if cos(x - y) > cos(x + y)
(B) never true
(D) true if cos(x + y) > cos(x - y)​

Answer 1

Answer:

D) true if cos(x+y)>cos(x-y)

Answer 2

Answer:

A

Step-by-step explanation:

As

(sinx+siny)2=(sinx+siny)(sinx+siny)

whereas

(sinx-siny) 2=(sinx+siny)(sinx-siny)

So here you can understand that the value of (sinx+siny)2 will always be greater as multiplication of added value is always greater than that of subtracted.

hope it will help you.