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4cos12cos48cos72=cos36

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4cos12cos48cos72=cos36

    • Posted by Surender Pratap Gautam 8 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Bk Jayesh Kumar 5 years, 8 months ago

    LHS = 4cos12cos48cos72      = 2 ( 2 cos 12cos48) cos 72       = 2 ( cos 60 + cos 36 ) cos 72       = 2cos 72 ( cos 60 + cos 36)        = 2cos72cos60 + 2 cos72cos36       = 2 cos 72 * 1/2 + ( 2cos72 cos 36)       = cos 72 + cos 108 + cos 36       = cos 72 + cos ( 180 - 72) + cos 36     = cos 72 - cos 72 + cos 36       = cos 36        = RHS  Read more on Brainly.in - https://brainly.in/question/2057801#readmore

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