Precalculus Ch. 4

what is the range of sine and cosine?

[-1,1]

arc length formula

s = rθ IN RADIANS

degrees to radians formula

degrees x π/180

radians to degrees formula

radians x 180/ π

area of a sector of a circle

A=1/2r²θ IN RADIANS

definition of cosine of any angle

cosθ=x/r

definition of sin of any angle

sinθ=y/r

definition of tangent of any angle

tanθ=y/x

CAST

C - cosine + (Q4) A - all + (Q1) S - sine + (Q2) T - tangent + (Q3)

csc

reciprocal of SINE

sec

reciprocal of COSINE

cot

reciprocal of TANGENT