1.

Find x + y if x= 13 sin^2 A and y=13 cos^2A+1​

Answer» ONG>Answer:

x+y=2n,n∈I.

Step-by-step explanation:

Given x−y=

3

1

....(1)

and COS

2

(πx)−sin

2

(πy)=

2

1

...(2)

⇒cosπ(x+y)cosπ(x−y)=

2

1

⇒cosπ(x+y)=1 (by (1))

⇒x+y=2n,n∈I.

Only option C SATISFIES above equation


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