If $cos 2 x + 2 cos x = 1$ then $sin^{2} x (2 - cos^{2} x)$ is equal to

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-1

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- \sqrt{5}

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\sqrt{5}

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Solution

The correct option is A 1

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Similar questions

\cos 2 x + 2 \cos x = 1

(2 - \cos^{2} x) \sin^{2} x

- 1

- \sqrt{5}

\sqrt{5}

If cos 2x + 2 cos x = 1 then, $(2 - c o s^{2} x) s i n^{2} x$ is equal to

\int \frac{(3 sin x - 2) cos x}{5 - {cos}^{2} x - 4 sin x} d x

\int \frac{(3 sin x - 2) cos x}{5 - c o s^{2} x - 4 sin x} d x

1) $c o s 2 x = c o s^{2} x - s i n^{2} x$

2) $1 + s i n 2 x = (c o s x + s i n x)^{2}$

3) $1 - s i n 2 x = (c o s x - s i n x)^{2}$

How many of the above statements are correct?

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