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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 5 years, 5 months ago

ICSE & ISC > Class 10 > Mathematics

1 answers

Ram Kushwah 5 years, 3 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

ANSWER

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