Find the correct value to fill in the space below. cos 50° = 2 cos^2 ____° -1

Question

Find the correct value to fill in the space below.

cos 50° = 2 cos^2 ____° -1

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Athena 2 days 2021-11-26T02:36:50+00:00 2 Answers 0

Answers ( )

    0
    2021-11-26T02:38:11+00:00

    Answer:

    25°

    Step-by-step explanation:

    Using the double angle trigonometric identity for cosine

    • cos2x = 2cos²x – 1

    Here 2x = 50° ⇒ x = 25°, thus

    cos50° = 2cos²25° – 1

    0
    2021-11-26T02:38:35+00:00

    Answer:

    25.

    Step-by-step explanation:

    Use the identity cos 2x = 2 cos^2 x – 1

    So cos 50 = 2 cos^2 25 – 1

    So the space  = 25.

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