a) If cos2A =11/25 show that cosA=6/5√2 ​

Question

a) If cos2A =11/25
show that cosA=6/5√2

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Gabriella 2 months 2021-10-09T18:45:47+00:00 1 Answer 0 views 0

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    2021-10-09T18:46:54+00:00

    Answer:

    we know that cos2A = 2cos^2A-1

    Step-by-step explanation:

    substitue this cos2A =11/25

    11/25 = 2cos^2A-1

    cos^2A= 36/50

    cosA=6/5√2

    hence proved

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