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If theta is an acute angle …

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If theta is an acute angle such that sectheta=cosec60*,find the value of2 cos2theta-1

    • Posted by Uday Singh 6 years, 4 months ago

    ICSE & ISC > Class 10 > Mathematics
    • 1 answers

    Ram Kushwah 6 years, 2 months ago

    secθ= cosec60

    =cosec(90-30)=sec30 ( As cosec(90-θ)=secθ)

    so θ=30

    Now 2cos2θ-1

    =2cos60-1

    =2*1/2-1

    =1-1=0

    0Thank You

    ANSWER
    http://mycbseguide.com/examin8/

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