please solve 35. #step by step
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But slope is the tan of angle of inclination which is also equal to derivative of the function at that point.
Thus if the value of derivative is positive at a point then the function is increasing and if its negative then the function is decreasing at that point.
So we just need to find the points for which derivatives are positive or negative . Thus we find the interval of all such points by plotting the derivative function.
This way we we will get the intervals in which the derivative is positive and also the intervals for which they are negative.
And this is how you arrive at the result .
:)