Integration of trig question (1 Viewer)

[akuchan]

Find the volume, to 2 decimal places, of the solid formed.... y = sec (pi) x is rotated about the x-axis from x = 0 to x = 0.15

answer is..0.51 units cubed, but how?

 

[jb_nc]

Double check the question... are you sure its y = sec pi * x?

 

[akuchan]

yep, i dont think i typed it wong, did i?

 

[pLuvia]

V=pi int. y²dx
=pi int. (0 to 0.15) sec²pix dx
=[tan pix](0 to 0.15)
=0.51

 

[jb_nc]

sin(3/20*pi)/cos(3/20*pi) is the exact form