Simplify the given expression. Expansion of any term is not necessary; proper recognition of the form of the expression leads to the proper result.cos2 4x - sin2 4x
A. 2 sin 4x
B. 
sin 16x
C. cos 8x
D. cos 4x
Answer: C
Mathematics
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Multiply the monomials.(9x7)(3x5)
A. 27x12 B. -27x12 C. -27x35 D. 27x35
Mathematics
Solve the equation for the unknown quantity x.5x = 26
A. 0.49 B. 3.04 C. 1.35 D. 2.02
Mathematics
The critical value corresponding to a level of significance of ? = 0.05 .
The probability density function of X is f (x) = 3/ x4 over [1, ?) . Compute the following quantity.
Mathematics
Use the product-to-sum and sum-to-product identities to prove the stated identity.tan 
= 
What will be an ideal response?
Mathematics