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# A few C2 questions! watch

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1. Can someone pls explain me how to plot a cos^2(x)/sin^2(x)/tan^2(x) graph? Because there was a question that i had to find the finite area between a cos^2(x) graph and the positive axis and the line (pi/3) using trapezium rule.

Also, when a question appears of find the values of x for which so, and so graph has an increasing function, i know that the first derivative is mean to be greater than zero, BUT is it greater than or equal to zero?? If i forget the line under ">" will i be penalized in an exam? coz i was taught it didnt have the line, now I dont knw
2. c0s^2/sin^2/tan^2 =1
3. (Original post by latentcorpse)
c0s^2/sin^2/tan^2 =1
What the hell?? I meant when you plot for instance the curve of cos^2 (x), how is it done? i.e. do you press cos twice the x's, or do you square the x then press cos or wht do you do?
4. cos^2x is just the accepted way of writing (cosx)^2, so you would plot it like a normal cosx graph but just square your values on the y-axis.
5. (Original post by latentcorpse)
c0s^2/sin^2/tan^2 =1
Actually it's undefined. Is 1/2/3 equal to (1/2)/3 = 16 or 1/(2/3) = 3/2 ?

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Updated: April 9, 2006
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