Precalculus Trigonometry Identities

cscθ=

1/sinθ

secθ=

1/cosθ

tanθ=

sinθ/cosθ

cotθ=

1/tanθ or cosθ/sinθ

sin2θ+cos2θ=

1

tan2θ+1=

sec2θ

cot2θ+1=

csc2θ

What is the domain, range, y-intercept, and x-intercept for y=cosx?

D: xER

R: [-1,1]

Y-Int.: (0,1)

X-Int.: pi/2+_pi n

What is the domain, range, y-intercept, and x-intercept for y=sinx?

D: xER

R: [-1,1]

Y-Int.: (0,0)

X-Int.: 0+_pi n

What is the domain, range, y-intercept, and x-intercept for y=tanx?

D: xER, x=/ pi/2+_pi n

R: yER

Y-Int.: (0,0)

X-Int.: 0+_pi n