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19. Find the exact value of sin( 20. A 20-ft ladder leans against a building so that the angle between the ground and the ladder

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19. Find the exact value of sin( 20. A 20-ft ladder leans against a building so that the angle between the ground and the ladder is 650. To the nearest tenth of a foot, how high does the ladder reach up the side of the building? 21. For f (x) = 4 sin(3x - 7) - 1, determine the amplitude, period, and midline equation; then sketch a graph of the function for two full periods 22. Find the exact value of cos- (sin ( ST ) )

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