SSC CGL 6 Sep 2016 Paper

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Question : 60 of 100

Marks: +1, -0

If sinA +

sin^2

A = 1, then what is the value of

cos^2

A +

cos^4

A ?

1
2
$1/2$
$1/4$

Solution:

sinA +

sin^2

A = 1
⇒ sinA = 1 –

sin^2

A =

cos^2

A
∴

cos^2

A +

cos^4

A
=

cos^2

A +

(cos^2 A)^2

=

cos^2

A +

sin^2

A = 1

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