Verify the identity.sin 
= cos ?
What will be an ideal response?
sin 
= sin ? cos 
+ sin 
cos ? = (sin ?)(0) + (1)(cos ?) = cos ?.
Mathematics
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Find the surface area of the surface S.S is the area cut from the plane z = 9y by the cylinder x2 + y2 = 9.
A. 9
B. 9
?
C. 6
?
D. 3
?
Mathematics
Evaluate the expression.cos(-90°)
A. 
B. -1
C. 0
D. Undefined
Mathematics
Determine the x- and y-intercepts on the graph of the equation.y = x + 7
A. x-intercept is 1; y-intercept is 7 B. x-intercept is 7; y-intercept is -7 C. x-intercept is 0; y-intercept is 0 D. x-intercept is -7; y-intercept is 7
Mathematics
Solve the problem.A car traveled 249 miles on 9
gallons of gas. How many miles per gallon did it get?
A. 27 mpg
B. 27
mpg
C. 27
D. 28 mpg
Mathematics