cos square 30 degree minus sin square 30 degree is equals to 1 minus 2 sin square 30 degree​

Question

cos square 30 degree minus sin square 30 degree is equals to 1 minus 2 sin square 30 degree​

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Nho 4 years 2021-08-13T07:22:16+00:00 1 Answers 13 views 0

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  1. danthu
    0
    2021-08-13T07:23:47+00:00
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    Answer:

    see explanation

    Step-by-step explanation:

    Not sure quite what you are asking, but

    Using the trigonometric identity

    cos² x = 1 – sin²x, then

    cos²x – sin²x

    = 1 – sin²x – sin²x

    = 1 – 2sin²x

    Thus

    cos²30° – sin²30° = 1 – 2sin²30°

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