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11 July, 17:41

If tan²A = 1 + 2tan²B

Show: COS2B = 1+2 cos2A

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  1. 11 July, 20:56
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    Step-by-step explanation:

    hello:

    here is this idea:

    tanA = sinA/cosA tanB = sinB/cosB

    cos²A+sin²A = 1 cos²B+sin²B = 1

    cos²A-sin²A=cos2A cos²B-sin²B=cos2B
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