Find the exact value by using a half-angle identity.cos 22.5°
A. - 
B. 
C. - 
D. 
Answer: B
Mathematics
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Evaluate the integral.
A. 216 B. 36 C. 7776 D. 1296
Mathematics
Solve the system.2x + 8y + 8z = 0x + 4y + 4z = 0x + y + z = -5
A. (-5, 5, -4) B. (-4, 5, -5) C. (-5, -4, 5) D. No solution
Mathematics
Find all complex zeros of the polynomial function, and write the polynomial in completely factored form.f(x) = x4 + 25x2 + 144
A. f(x) = (x + i)(x - i)(x + 12i)(x - 12i) B. f(x) = (x + 3i)(x - 3i)(x + 4i)(x - 4i) C. f(x) = (x + 3 + 4i)2(x + 3 - 4i)2 D. f(x) = (x + 3i)2(x + 4i)2
Mathematics
Complete the ordered pair for the equation.y = -2x - 5(0, )
A. (0, 0) B. (0, -7) C. (0, -5) D. (0, -23)
Mathematics