calculas
posted by Sagar .
consider the following.
Function
y = cos 3x
point (pi/4, square root of 2/2)
(a) Find an equation of the tangent line to the graph of f at the given point. (Let x be the independent variable and y be the dependent variable.)

calculas 
Steve
first, find the slope of the tangent line anywhere:
y' = 3sin(3x)
so, at x=π/4, y = 3sin(3π/4) = 3/√2
Now you have a point and a slope, so the line is
y + 1/√2 = 3/√2 (x  π/4)
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