Establish the identity.cos(4?) = cos4 ? - 6 sin2 ? cos2 ? + sin4 ?
What will be an ideal response?
cos(4?) = cos[2(2?)] = cos2(2?) - sin2(2?) = 
= cos4 ? - 6 sin2 ? cos2 ? + sin4 ?
Mathematics
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Solve.
x - 
= -4
A. x = 17 B. x = -17 C. x = -15 D. x = 15
Mathematics
Use the graph of f(x) to solve the inequality.f(x) < 0
A. -4 < x < -2 or x > 1 B. x < -4 or -2 < x < 1 C. x < -4 or x > -2 D. -2 < x < 1
Mathematics
Determine whether the statement is true or false. 8 ? {1, 2, 3, ..., 15}
A. True B. False
Mathematics
Evaluate the expression. Do not use a calculator.(7 - 2)!
A. 362,880 B. 10,080 C. 20 D. 120
Mathematics