Question
Asked Oct 24, 2019
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Find the exact value of the expression using the provided information.

Find cos(s + t) given that cos s =1/3, with s in quadrant I, and sin t=-1/2  with t in quadrant IV.

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Expert Answer

Step 1

To determine the value of cos (s + t).

Step 2

Given information:

The trigonometric functions are given below.

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1 cos (s)sin quadrant 1 . ,tis in 4 sin (t) quadrant

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Step 3

Used concept:

  1. 1. Pythagoras theorem:

Let hypotenuse is h, perpendicular...

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h P b From the Pythagoras theorem 2. The formula of cos(s+t) is given below. cos(st) cos(s) cos (t)-sin(s)sin(t)

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Tagged in

Math

Trigonometry

Trigonometric Ratios