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6 + 9 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

The solution of differential equation \(\frac{{dy}}{{dx}} = {\sec ^2}x\) is:

y = secx + c

y = cosx + c

y = tanx + c

\(y = {\csc ^2}x + c\)