Trig Identities

sinx =

1/cscx

cscx =

1/sinx

cosx =

1/sec

secx

1/cosx

tanx =

1/cotx

cotx =

1/tanx

sin(-x)

-sin(x)

cos(-x)

cos(x)

tan(-x)

-tan(x)

csc(-x)

-csc(x)

sec(-x)

sec(x)

cot(-x)

-cot(x)

sin²x+cos²x =

1

1+cot²x =

csc²x

tan²x + 1 =

sec²x

Difference of squares

a² - b² = (a + b)(a - b)

x²-1

= (x + 1)(x - 1)

sin(pi/2 - x)

cos(x)

tan(pi/2 -x)

cot(x)

sec(pi/2-x)

csc(x)

cos(pi/2 - x)

sin(x)

cot(pi/2 - x)

tan(x)

csc(pi/2 - x)

sec(x)