Express the trigonometric function in terms of the same function of a positive acute angle.cos 405°

A. -cos 45°
B. -cos 90°
C. cos 45°
D. cos 90°

Answer: C

Mathematics

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Evaluate the integral using the given substitution., u = cot 3?

A.  csc3 3? cot2 3? + C
B.  cot2 ? + C
C. -  cot2 3? + C
D. -  tan2 3? + C

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Mathematics

Graph the function on a grapher. Then use the grapher to find the x- and y-intercepts. Round to the nearest hundredth if necessary.f(x) = 2.66x2 - 3.421x - 6.87

A. (2.37, 0), (-1.09, 0), (0, -6.87) B. (2.37, 0), (-1.09, 0) C. (-1.09, 0), (2.37, 0), (0, -6.87) D. No x-intercepts, (0, -6.87)

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Mathematics

Solve the problem.If sin ? = -0.3, find the value of sin ? + sin (? + 2?) + sin (? + 4?).

A. -0.9 B. -0.3 C. 1.1 D. -0.9 + 6?

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Mathematics

Simplify the radical expression. Assume that all variables represent positive real numbers.

A. 8k7q8 
B. 8k3q4 
C. 8k3q4 
D. 8q4 

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Mathematics