Solve the problem.When a person bends at the waist with a straight back, the force, F, exerted by the person's lower back muscles can be estimated with the formula 
where w is the person's weight, and ? is the angle made by the person's torso relative to the horizontal. Use the sum identity for sine to simplify F.
A. F = 2.89w sin ?
B. F = 2.89w (sin ? + cos ?)
C. F = -2.89w cos ?
D. F = 2.89w cos ?
Answer: D
Mathematics
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