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Chapter 9: Q. 3 (page 591)

The sum formula for the cosine function is $C o s (A + B)$

Short Answer

Expert verified

$C o s (A + B) = C o s A C o s B - S i n A S i n B$

Step by step solution

Step 1. Given

Given trigonometric function

$C o s (A + B)$ .

Step 2. Concept

We will use standard formula for trigonometric function to get the desired results.

Step 3. Calculation

$C o n s i d e r C o s (A + B) t h e r e f o r e, C o s (A + B) = C o s A C o s B - S i n A S i n B$

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Most popular questions from this chapter

An equation whose variables are polar coordinates is called a(n) ____ ______ .

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The sum formula for the cosine function is $C o s (A + B)$

Short Answer

Step by step solution

Step 1. Given

Step 2. Concept

Step 3. Calculation

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Most popular questions from this chapter

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The sum formula for the cosine function isCos(A+B)

Short Answer

Step by step solution

Step 1. Given

Step 2. Concept

Step 3. Calculation

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Most popular questions from this chapter

Recommended explanations on Math Textbooks

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Study anywhere. Anytime. Across all devices.

The sum formula for the cosine function is $C o s (A + B)$