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Chapter 9: Q. 3 (page 591)

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

Short Answer

Expert verified

Cos(A+B)=CosACosB-SinASinB

Step by step solution

01

Step 1. Given

Given trigonometric function

Cos(A+B).

02

Step 2. Concept

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

03

Step 3. Calculation

ConsiderCos(A+B)therefore,Cos(A+B)=CosACosB-SinASinB

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