Tried working ahead. Super stuck lol (1 Viewer)

B1andB2

oui oui baguette
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differentiate x=5tantheta and rearrange to get dx=5sec^2theta dtheta

replace x's with given sub and dx with above

factorise 25 out of denominator to use trig identity to simplify

then just simplify indices and stuff should cross out, you'll probably be able to follow from there

oh yeah don't forget to replace any lone thetas (if you end up with one) by rearranging given sub if needed/ draw triangle to get stuff back in x form

2 marks is a bit stingy though
 
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