calculus question

Question

An oil storage tank ruptures at time t = 0

 and oil leaks from the tank at a rate of r(t) = 115e^−0.01t

 liters per minute. How much oil leaks out (in liters) during the first hour? (Round your answer to the nearest liter.) liters

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Evaluate the indefinite integral. (Use C for the constant of integration.)

	sin(28x) sin(cos(28x)) dx

Answer 1

integral of sin28xsin(cos28x)

= cos(cos(28x))/28 + C

use u subsitution

u=cos28x

u'=du/dx = -28sin28x

dx =(-1/28sin28x)du

or use an integral calculator on line