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OpenStudy (anonymous):
Determine the open intervals on which the graph of the function y=5x-tan4x, (-pi*/8, pi*/8) is concave upward or concave downward.
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OpenStudy (bahrom7893):
First find the 2nd derivative, set it equal to 0, and solve for x. What do you get?
OpenStudy (anonymous):
The 2nd derivative was -8secx^2(tanx)
OpenStudy (anonymous):
Then I don't know what to do
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