помогите f(x)=3sin^2x, вычислите f`(x)

Катеты прямоугольного треугольника равны 8 и 18. Найдите радиус описанной около треугольника окружности.

In the streets, roads and squares of the town we see people walking and vehicles driving. The vehicles are: trams, buses, trolley-buses, taxis and motor-cars, motor-cycles, motor-scooters and bicycles. Along the streets there are street lamps, at the corners of the streets there are traffic lights. The street lights are switched on when it gets dark; they are switched off when it gets light. When the red traffic light is switched on, the traffic stops; when the green light is switched on, the ve­hicles drive on. Along the streets we also see bus, trolley-bus and tram stops. People get on and off public transport there. In the streets there are also Tube stations where people get on and off the underground electric railway. At big crossroads in large towns and cities there are subways for pedestrians and fly-overs for vehicles. At nearly all street corners there are pedestrian crossings for people to cross the road. In England vehicles drive on the left. In Ukraine the traffic drives on the right. Outside the towns we travel from one place to another by train, plane or boat.ПЕРЕВИДИТЕ ТЕКСТ ПОЖАЛУЙСТА