cos 2 theta is equals to 2 cos squared theta minus 1
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That is the answer and mark my answer as brainliest
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= 0° or, 180°
Step-by-step explanation:
We have,
To find, the value of = ?
∴
⇒
⇒
⇒
⇒ = ± 1
⇒ = 1 or, = - 1
We know that,
= 1 and = - 1
∴ = 1
⇒ =
⇒ = 0°
Also,
= - 1
⇒ =
⇒ = 180°
Thus, = 0° or, 180°
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