3.7 Determine the Laplace transform of the following functions: ∗(a) x1(t) = 25 cos(4πt + 30◦) δ(t) (b) x2(t) = 25 cos(4πt + 30◦) δ(t − 0.2) (c) x3(t) = 10 sin(3t) t u(t) (d) x4(t) = d2 dt2 [e−4t u(t)]

The radius of the circle is 4 cm and the measure of the central angle is 90° the area of the sector with a central angle measuring 90° and radius of length 4 cm is vt cm the triangle in the sector is 4 cm the area of the triangle is v/cm² the area of the segment of the circle is (471 - ) cm?

Ineed with number 6 , explain how to get 1978

Me. i can't figure out this question. give an explanation too. .