If you have triangle ABC and angle C is 90 degrees, which of the following must be true? sin A = sin B
cos A = sin B
tan A = tan B
sin A = tan B

An airplane is taking off headed due north with an air speed of 173 miles per hour at an angle of 18° relative to the horizontal. the wind is blowing with a velocity of 42 miles per hour at an angle of s47°e. find a vector that represents the resultant velocity of the plane relative to the point of takeoff. let i point east, j point north, and k point up.