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Trigonometry (MindTap Course List)

8th Edition
Charles P. McKeague + 1 other
ISBN: 9781305652224
Textbook Problem

Evaluate cos ( sin 1 2 3 ) without using a calculator.

To determine

To calculate:

The value of given equation.

Explanation

Given Information:

cos(sin123)

Concept Used:

We find the value of given equation by using Pythagoras theorem: h2=p2+b2 and assuming the angle.

Calculation:

The given equation is:

cos(sin123)

Let sin123=θ

Therefore sinθ=23

As we know that sinθ=perpendicularhypotenuse

Perpendicular =2k & Hypotenuse =3k

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