The below helps you remember the signs (+ or -) of the trig functions in
each of the four "quadrants."

All Students Take Calculus

ASTC

A = All are positive S = just Sine is positive T = just Tangent is positive C = just Cosine is positive

Another way ...

The "CAST" rule (counterclockwise starting in quadrant IV)

S A          II  I
T C         III  IV

The below helps you remember the ratios of the sin, cos, and tan
functions.



O = Opposite  A = Adjacent H = Hypotenuse  

sine S = O/H  cosine C = A/H  tangent  T = O/A     

My favorite nonsense phrase ...

Send Out Help Cousins Are Helpful Tickle Our Ankle

SOHCAHTOA (say it out loud: so cah toah) 

Not very close at all but I think of ...

Sacagawea