Simplify the expression by using a sum or difference identity.cos (-35°) cos 55° + sin (-35°) sin 55°
A. 
B. 0
C. -1
D. 1
Answer: B
Mathematics
You might also like to view...
Which of the following is not true? ?
A.
?
and 
may be a glide reflection.
B.
? and may be a translation.
C.
? and may be a reflection at a vertical line.
D.
?
and 
may be a rotation.
E.
?
and 
may be a rotation.
Mathematics
Using the horizontal-line test, determine whether the function is one-to-one.f(x) = x3 - 5x + 2
A. Yes B. No
Mathematics
Write a chain rule formula for the following derivative.
for u = f(r, s, t); r = g(y), s = h(z), t = k(x, z)
A. 
= 
B. 
= 
C. 
= 0
D. 
= 
Mathematics
Use the Trapezoidal Rule with n = 4 steps to estimate the integral.
A. 24 B. 96 C. 30 D. 48
Mathematics