Test 1 - Things to Know!

Pythagorean Identities

100

______ + _______ = 1

sin²x + cos²x = 1

200

_____ + ______ = sec²x

tan²x + 1 = sec²x

300

_____+_____=csc²x

1 + cot²x= csc²x

Double Angle Formulas

100

sin(2x) = ________

sin(2x) = 2sin(x)cos(x)

200

cos(2x) = ______ - _____

cos(2x) = cos²x - sin²x

300

cos(2x) = 2_____ - _____

cos(2x) = 2cos²x - 1

400

cos(2x) = ___ - 2____

cos(2x) = 1 - 2sin²x

Reciprocal Functions

100

1/sinx

cscx

200

1/cosx

secx

300

1/tanx

cotx

Inverse Functions

100

Inverse of sin(x)

sin^-1x or arcsinx

200

Inverse of cos(x)

cos^-1x or arccosx

300

Inverse of tan(x)

tan^-1x or arctanx