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1. Quick question

i got this question from a friend and its bugging me because i cannot understand it. i just cannot understand what it means... here is it, word for word what i have on the assigned paper "if f(x) = x^n , "n" is a positive interger, the first derivative of f(x) which is identically zero is "...
2. Stupid brain cramp

hey, i need to simplify this, and im having a brain fart:confused: ...can u help me? f(x)= cosx(3cos3x) + (sin3x)(-sinx) i then have to find f(pi/6), but im hoping i can do that once this is simplified... thanks Gill
3. Parabola problem

Hey I have a math problem that does not seem to work out. It is a word problem about a suspension bridge. The bridge's main cable is in the shape of a parabola, and the entire bridge, the road, is 200 ft long. The ends of the bridge, the longest virtical cables on the bridge, are 50 ft...
4. Trig Proof

it works! thanks
5. Trig Proof

sorry but that still seems to not work, wat can i do? am i doing something wrong?
6. Trig Proof

yea ok this problem has been making me mad for the past 2 weeks or so (it's a summer project due next week) any help would b great sqrt of ((1-sinx)/(1+sinx))= |secx-tanx| i tried: =|secx-tanx| =|(1/cosx)-(sinx/cosx)| =|(1-sinx)/cosx| and i need it to equal the other side without...