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Please help with this trig identity?

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cos((3pi/2)-x)+cos((3pi/2)+x)=0
asked Apr 17, 2013 in TRIGONOMETRY by homeworkhelp Mentor

1 Answer

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cos((3π/ 2) - x) + cos((3π/ 2) + x)

Recall :Trigonometry co function identities  cos((3π/ 2) - x) = -sinx and cos((3π/ 2) + x) = sinx

Substitute cos((3π/ 2) - x) = -sinx and cos((3π/ 2) + x) = sinx in the above problem

 -sinx + sinx = 0.

Hence the given problem is solved

answered Apr 18, 2013 by diane Scholar

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