Question

having trouble with this
If f(x) = 15.0cosx, then what is the area enclosed by the graph of the function, the horizontal axis, and vertical lines at x = 0 degrees and x = 90 degrees?

Answer 1

area under function curve = integral of function

Answer 2

integrate between x = 0 and 90

Answer 3

0 and pi/2

Answer 4

so is it 15sin90-15sin0 or do i drop the 15

Answer 5

keep the 15.

it's 15(sin(pi/2) - sin(0))

Answer 6

i used 15(sin90-sin0) and got it thanks tho

Answer 7

i know it's the same now because you're using a simple trig function.

but if the integral gave xsinx from 0 to 90, you'd have to use pi/2 instead of 90 (and make sure your calculator is set to radians and not degrees)