Rewrite the expression as the sine, cosine, or tangent of a double angle. Then find the exact value of the trigonometric expression without the use of a calculator.cos2 112.5° - sin2 112.5°
A. 
B. - 
C. 
D. - 
Answer: D
Mathematics
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Calculate the arc length of the indicated portion of the curve r(t).r(t) = (9 + 2t2)i + (2t2 - 8)j + (5 - t2)k, 1 ? t ? 3
A. 72 B. 24 C. 30 D. 90
Mathematics
Reduce to lowest terms.- 
A. 
B. - 
C. - 
D. - 
Mathematics
Solve the equation. Use the change of base formula to approximate an exact answer to the nearest hundredth when appropriate.10x = 100
A. x = 2 B. x = -2 C. x = 0.01 D. x = 100
Mathematics
Simplify.-(6x - 2)
A. -6x - 2 B. 6x + 2 C. -6x + 2 D. 6x - 2
Mathematics