Double Angles Formulas

Useful trig double angle formulas to save you time when integrating.

1 =

sin²(x) + cos²(x)

csc²(x) =

1 + cot²(x)

sec²(x) =

tan²(x) + 1

2sin(x)cos(x) =

sin(2x)

cos²(x) - sin²(x) =

cos(2x)

1 - 2sin²(x) =

cos(2x)

2cos²(x) - 1 =

cos(2x)

2tan(x) / (1 - tan²(x)) =

tan(2x)

(1 - cos(2x)) / 2 =

sin²(x)

(1 + cos(2x)) / 2 =

cos²(x)