4. (a) The following diagram shows two sectors, POQ and ROS. 0Q is x cm and OS is (x + 1) cm. Angle POQ = 0. R x cm If 0 =radians, calculate the area of the shaded region in terms of x.

Trigonometry (MindTap Course List)
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ISBN:9781305652224
Author:Charles P. McKeague, Mark D. Turner
Publisher:Charles P. McKeague, Mark D. Turner
Chapter2: Right Triangle Trigonometry
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4. (a) The following diagram shows two sectors, POQ and ROS. 0Q is x cm and OS
is (x + 1) cm. Angle POQ = 0.
R
х ст
If 0 =radians, calculate the area of the shaded region in terms of x.
(b) Given that cos 60° =, sin 45° =
V3
and sin 120° = without the use of a
calculator, evaluate cos 165°. State your answer in the simplest surd form.
(c) Prove the identity-
cos?x
= 1+ sin x
1-sin x
Transcribed Image Text:4. (a) The following diagram shows two sectors, POQ and ROS. 0Q is x cm and OS is (x + 1) cm. Angle POQ = 0. R х ст If 0 =radians, calculate the area of the shaded region in terms of x. (b) Given that cos 60° =, sin 45° = V3 and sin 120° = without the use of a calculator, evaluate cos 165°. State your answer in the simplest surd form. (c) Prove the identity- cos?x = 1+ sin x 1-sin x
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