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Prove that

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sin (90-x)=cosx?

asked Jul 19, 2014 in TRIGONOMETRY by anonymous
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1 Answer

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image

Apply the sum of angle formula

image

In this case image

Left hand side identity = image

                                  image

                                  image

                                  image

                                   = Right hand side identity.

answered Jul 19, 2014 by david Expert

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