Prove that the equation is an identity.cos4x = 
What will be an ideal response?
= 
= cos2x ? 
= cos2x - sin2x + sin4x
= cos2x - sin2x(1 - sin2x)
= cos2x - sin2x ? cos2x Pythagorean identity
= cos2x(1 - sin2x)
= cos2x ? cos2x Pythagorean identity
= cos4x
Mathematics
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Suppose f is a linear function and that 
, and 
. Then the slope of f is positive.
Answer the following statement true (T) or false (F)
Mathematics
Find a1, r, an, n, or Sn for the geometric sequence, as instructed.r = - 2, n = 5, a5 = 64; Find a1.
A. - 8 B. 4 C. - 2 D. 64
Mathematics
Identify the expression as a monomial, a binomial, a trinomial, or not a polynomial.
A. not a polynomial B. trinomial C. monomial D. binomial
Mathematics
Convert from one measure to the other.11 feet to inches
A. 396 inches B. 33 inches C. 132 inches D. 44 inches
Mathematics