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Please help Please help Please help Find the exact value of the following trigonometric expression. Do not use any trigonometric functions on a calculator or

Please help Please help Please help

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Find the exact value of the following trigonometric expression. Do not use any trigonometric functions on a calculator or other technology, as they will not provide you with exact answers. Decimal approximations will be marked wrong. 15 sin 2 cos ' ( 17Find the exact value of the following trigonometric expression. Do not use any trigonometric functions on a calculator or other technology, as they will not provide you with exact answers. Decimal approximations will be marked wrong. 45 Cos 2 arctan 28In the answer box below, type an exact answer only (i.e. no decimals). You do not need to fully simplify/reduce fractions and radical expressions. If tan B = - 40 with / in quadrant IV, then find cos(2B). cos (28) =

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