Author: Sergiu Funieru

+1 The formula for sin (-a) [formula for the sine of minus a] +1

+1 The formula for tan (a + b) [formula for the tangent of sum] +1

+1 The formula for tan (a – b) [formula for the tangent of difference] +1

+1 The formula for csc (The formula for the cosecant) +1

+1 The formula for cot (The formula for the cotangent) +1

0 The formula for tg (The formula for the tangent) 0

0 The formula for sin 3a [formula for the sine of triple angle] 0

0 The formula for sin 2a [formula for the sine of double angle] 0

0 The formula for cos (a – b) [formula for the cosine of difference] 0

0 The formula for cos (a + b) [formula for the cosine of sum] 0