Verify the identity.cos
= -sin x
What will be an ideal response?
cos 
= cos x cos 
- sin x sin 
= (cos x)(0) - (sin x)(1) = - sin x.
Mathematics
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Solve the problem.If f(x) is a differentiable function and f'(c) = 0 at an interior point c of f's domain, and if 
for all x in the domain, must f have a local minimum at 
Explain.
What will be an ideal response?
Mathematics
Find the indicated term of the sequence.an = ln en; a114
A. 1 B. ln 114 C. 115 D. 114
Mathematics
Solve the equation.
x - 
x = 3
A. {-90} B. {45} C. {-45} D. {90}
Mathematics
Approximate, to the nearest whole number, the volume of the cone satisfying the given conditions.radius = 4 in., height = 3 in.
A. 100 in.3 B. 75 in.3 C. 50 in.3 D. 25 in.3
Mathematics