Refer to the figure, in which a unit circle is drawn. The line segment DR is tangent

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Refer to the figure, in which a unit circle is drawn. The line segment DR is tangent to the circle and 0 is acute 

(a) Express the area of ΔOBC in terms of sin θ and cos θ. 

(b) Express the area of ΔOBD in terms of sin θ and cos θ.

(c) The area of the sector O͡B͡C͡ of the circle is 1/2 θ where θ is measured in radians. Use the results of parts (a) and (b) and the fact that

Area AOBC < Area ÓBC < Area AOBD


to show that

sin 0 cos 0


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Related Book For  answer-question

Precalculus

ISBN: 978-0321716835

9th edition

Authors: Michael Sullivan

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