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Math Help - Some trig qs - need help.

  1. #1
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    Some trig qs - need help.

    1. Find exact value of

    sin2pi/3

    2. find the area enclosed between the curve y = cos2x, the x-axis and the lines x = -pi/6 and x = +pi/6

    3. simplify:

    lim 2tanx/x
    x ->0

    4. find the equation of the tangent to the curve y = sin3x at the point (pi/4, 1/sqroot2)

    5. Use the trapezoidal rule with 4 subintervals to find an approximation to the volume of the solid formed by rotating the curve y= sqroot cosx about the x-axis from x = 0 to x =pi/2.
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  2. #2
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    Quote Originally Posted by MathsBeforeBedtime View Post
    1. Find exact value of

    sin2pi/3

    2. find the area enclosed between the curve y = cos2x, the x-axis and the lines x = -pi/6 and x = +pi/6

    3. simplify:

    lim 2tanx/x
    x ->0

    4. find the equation of the tangent to the curve y = sin3x at the point (pi/4, 1/sqroot2)

    5. Use the trapezoidal rule with 4 subintervals to find an approximation to the volume of the solid formed by rotating the curve y= sqroot cosx about the x-axis from x = 0 to x =pi/2.
    What have you tried? Where are you stuck? Apart from other things, there are too many questions here. Given the nature of these questions, please re-post more - one question per thread in the appropriate subforum and with all your working (say where you get stuck). See rule #8: http://www.mathhelpforum.com/math-he...ng-151418.html.

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