helping granddaughter with math homework

[Wyrm]

I just went about memorizing certain values. Like sin(pi/4) = cos(pi/4) = 0.7170, sin(pi/3) = cos(pi/6) = 0.8660, and sin(pi/6) = cos(pi/3) = .5 (then used the various mulitples of those around the circle by remembeingr what the sign of those trig functions were for each quadrant, so quad 1 = positive, quad 2 sin pos, cos neg, quad 3 both neg, quad 4 sin neg, cos pos). Then it just becomes a quick memorization of tan, cot, sec, and csc (sin/cos, cos/sin, 1/sin, and 1/cos) and doing that math quick in the head.

That hurts my brain.