Trig formulas

sin (A+B)

sin (A+B)

sinAcosB + cosAsinB

sin (A-B)

sinAcosB - cosAsinB

cos (A+B)

cosAcosB - sinAsinB

cos (A-B)

cosAcosB + sinAsinB

tan (A+B)

tanA + tanB ÷ 1 - tanAtanB

tan (A-B)

tanA - tanB ÷ 1 + tanAtanB

sin (2A)

2sinAcosA

cos (2A)

1. cos²A - sin²A

2. 2cos²A - 1

3. 1 - 2sin²A

tan (2A)

2tanA ÷ 1 -tan²A

Arithmetic sequence formula

An = A1 + d(n-1)

Sum of an arithmetic sequence

Sn = n/2 (A1 + An)

Geometric sequence formula

An = A1 • r^n-1

Sum of a geometric sequence

Sn = A1 (1-r^n) ÷ 1-r

Infinite series formula

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S∞ = A1 ÷ 1 - r