Verify the identity.cos 
= -sin x
What will be an ideal response?
cos
= cos(x)cos
- sin(x)sin
.
Since cos
= 0 and sin
= 1, then
cos
= cos(x)(0) - sin(x)(1) = - sin x.
Mathematics
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Find the slope of the line.
A. -3
B. Undefined
C. 0
D. 
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Solve by the substitution method.8x + 9y = -11-2x + 7y = -25
A. (-11, -25) B. (1, -2) C. (2, -2) D. (2, -3)
Mathematics
Rationalize the denominator. Assume all variables have nonzero values.
A. 
B. 
C. 
D. 15
Mathematics
Solve the equation.3(x - 1.9) = 9.3
A. 2.467 B. 5 C. 3.733 D. 15
Mathematics