3.12 Equivalent Expressions

cos^2x + sin^2x

1

1 + tan^2x

sec^2x

1 + cot^2x

csc^2(x)

2sinxcosx

sin(2x)

cos^2(x) - sin^2(x)

cos(2x)

1 - 2sin^2x

cos(2x)

2cos^2x - 1

cos(2x)

sin(a)cos(b) + cos(a)sin(b)

sin(a + b)

sin(a)cos(b) - cos(a)sin(b)

sin(a - b)

cos(a)cos(b) - sin(a)sin(b)

cos(a + b)

cos(a)cos(b) + sin(a)sin(b)

cos(a - b)

1 - cos^2x

sin^2x

1 - sin^2x

cos^2x