Area Under Curves - Calculate & Learn

[don.bandar]

Please guys i have only one shot and I tried but i couldn't

her is the prblem


[PLAIN]http://img87.imageshack.us/img87/5229/27745883.jpg



My Try:

[PLAIN]http://img806.imageshack.us/img806/9801/scan0002y.jpg

 

[tiny-tim]

welcome to pf!

hi don! welcome to pf!

(have a pi: π and an integral: ∫ and try using the X² and X₂ icons just above the Reply box )

Please guys i have only one shot and I tried but i couldn't

her is the prblem

that looks ok to me

now put in the values at x = π/2 and 3π/2 …

what do you get? ​

 

[don.bandar]

Hi Tim,

Look, if i do it with the calculator the answer = 8 unit²
but the question askes me for the answer with the pi

for example: = 3pi

and so on


could you wxplai to me please

 

[tiny-tim]

hi don!

patient to doctor: it hurts when i do that

doctor to patient: then don't do that!

… if i do it with the calculator …

then don't do it with the calculator!

just do it yourself …

5[x/2 + sin(2x)/4]_π/2^3π/2 …

you'll obviously get a multiple of π from the first bit, won't you?

 

[don.bandar]

hi Tim,

i know about not using the cal., but unlikely, i don't know how to deal with the pi in such situation. got it?!


i hope if you could explain this point to me

 

[tiny-tim]

what's the difficulty?

[x/2]_π/2^3π/2

is the value of x/2 when x = 3π/2 minus etc …

what did you make it?​

 

[don.bandar]

Hi Tim,

thank you for your help and encouraging

lt was a average question but i didn't notice that it was easy

now I knew it

the answer is = 5pi/2


thank for your help

i wish you all the best