Hi, a struggled with these questions in the excercise:
In 1v) the answer was given as cosx/sinx=cotx, im sure this is correct but I have no idea why, could someone please explain to me why that is the answer? In 3 and 4 I am stuck with finding the gradient, i can derive the y value easy enough but I get stuck when I have to sub the x value in to work out the gradient. I got y'=3(sec^2)3x in question 3 and y'=-cos(pi-x) in question 4. Like I said though, I get stuck when I have to sub the x value in to work out the gradient.
Any help is greatly appreciated.
In 1v) the answer was given as cosx/sinx=cotx, im sure this is correct but I have no idea why, could someone please explain to me why that is the answer? In 3 and 4 I am stuck with finding the gradient, i can derive the y value easy enough but I get stuck when I have to sub the x value in to work out the gradient. I got y'=3(sec^2)3x in question 3 and y'=-cos(pi-x) in question 4. Like I said though, I get stuck when I have to sub the x value in to work out the gradient.
Any help is greatly appreciated.