What is the value ofcos (45- A)-cos (45+ A) ?45.(B)(C)(D)2 cos A、/2 – InterviewSolution

1.	What is the value ofcos (45- A)-cos (45+ A) ?45.(B)(C)(D)2 cos A、/2 sin A2 sin A2 cos A
Answer» cos(45°-A)-Cos(45°+A)=cos45°cosA+sin45°sinA-cos45°cosA+sin45°sinA=2sin45°sinA=2(1/√2)sinA=√2 sinA

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