RRB NTPC Mains or Stage 2 Model Paper 3 with solutions

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Question : 38 of 120

Marks: +1, -0

I f

cosA + cos^2A = 1

, then

sin^2A + sin^4A

is equal to

1
$1/ 2$
0
– 1

Solution:

Cos A + cos^2 A = 1

cos A = 1 – cos^2 A

= sin^2 A sin^2 A + sin^4 A

= sin^2 A + cos^2 A = 1

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