Question

2 cos square theta equal to?

Answer 1

Answer:

2 cos^ 2theata =2 sin^2 theata

Step-by-step explanation:

because sin^2 theata + cos^2 theata =1

Answer 2

Answer:

$2cos^{2}\theta =2-2sin^{2}\theta$

Step-by-step explanation:

Given: $2cos^{2} \theta$

To find its equivalent expression.

By trigonometry identities we know that: $sin^{2}\theta+cos^{2}\theta=1$.

So, $cos^{2}\theta=1-sin^{2}\theta$   .....(1)

Substitute equation (1) in $2cos^{2} \theta$ we get:

$2cos^{2} \theta=2(1-sin^{2}\theta)$

           $=2-2sin^{2}\theta$

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