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If sin(A)=−35sin(A)=-35 with AA in QIVQIV, and sin(B)=45sin(B)=45 with BB in QIIQII then cos(A+B)=

If sin(A)=−35sin(A)=-35 with AA in QIVQIV, and sin(B)=45sin(B)=45 with BB in QIIQII then cos(A+B)=

Algebra & Trigonometry with Analytic Geometry
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section: Chapter Questions
Problem 54RE
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For the following problem, assume that all given angles are in simplest form, so that if AA is in QIVQIV you may assume that 270∘<A<360∘270∘<A<360∘.

If sin(A)=−35sin(A)=-35 with AA in QIVQIV, and sin(B)=45sin(B)=45 with BB in QIIQII then

cos(A+B)=

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