cos(45+A)- cos(45-A)
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Step-by-step explanation:
=COS(45+A)-COS(45-A)
=(COS45COSA-SIN45 SINA) -(COS45COSA+SIN45 SINA)
=COS45COSA-SIN45SINA-COS45COSA-SIN45SINA
=-2SIN45SINA
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