integrating trig functions?? (1 Viewer)

[Newberry]

can someone please help me with this question
i need to find the are enclosed between the curve y=cos^(-1)x the y-axis and the lines y=0 and y=pi/4.
do i need to rearange y=cos^(-1)x to make it in terms of x or do i just need to find the new boundaries??

 

[abcd9146]

just change the subject to x... and then integrate between 0 and pi/4

 

[Newberry]

thankyou!!

 

[Rax]

thats the ticket, I always forget those ones, Start doing integration by parts and then realise I am doing Ext I :X