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(sin 72 + cos 18) (sin …

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(sin 72 + cos 18) (sin 72 - cos 18)

    • Posted by Shubh Patel 5 years, 4 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Yogita Ingle 5 years, 4 months ago

     (sin72° + cos18°)(sin72° − cos18°).

    = (sin2 72° – cos2 18°)

    = (sin2 72° – cos2 (90° – 72°)

     = sin2 72° – sin2 72°

    = 0

    2Thank You

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