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Formulas

1.

sin2x

2sinxcosx

2.

cos2x

cos²x - sin²x

2cos²x - 1

1 - 2sin²x

3.

tan2x

2tanx / 1 - tan²x

4.

sin(A+B)

sinAcosB + sinBcosA

5.

sin(A-B)

sinAcosB - sinBcosA

6.

cos(A+B)

cosAcosB - sinAsinB

7.

cos(A-B)

cosAcosB + sinAsinB

8.

tan(A+B)

tanA + tanB / 1 - tanAtanB

9.

tan(A-B)

tanA - tanB / 1 + tanAtanB

10.

sin²x + cos²x

1

11.

1 + tan²x

sec²x

12.

1 + cot²x

csc²x