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Posted by on Wednesday, February 1, 2012 at 7:28am.

in proving trigonometric identities if sec theta - tan theta sin theta is equal to cos theta. what is the correct answer?

  • trig - , Wednesday, February 1, 2012 at 11:13am

    secØ - tanØsinØ = cosØ

    LS (left side)
    = 1/cosØ - (sinØ/cosØ)sinØ
    = (1 - sin^2 Ø)/cosØ
    = cos^2 Ø/cosØ
    = cosØ
    = RS

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