Verify the identity
cos ( x + pi/2) = -sin x

Passengers usually start to board their flights 1 hour before the scheduled take off time. the gate will be closed 15 minutes before the takeoff time. jack’s plane is scheduled to take off at 12: 05 a.m. if he arrives at the gate at 11: 45 p.m., can he board the flight?

If square root x = -7, then x= -49 true or false

Draw a scaled copy of the circle using a scale factor of 2