Formulas of trigonometric functions is an important concept in mathematics, which describes the relationship between the angles and sides of a triangle. Therefore, as a math teacher, I have compiled several commonly used formulas of formulas of trigonometric functions for you:
Sine theorem: sinA/a = sinB/b = sinC/c
Cosine theorem: c? = a? + b? - 2ab cosC
Tangent theorem: tanA = a/b
Cotangent theorem: cotA = b/a
The formula for the sum of two angles:? sin(A+B) = sinAcosB + cosAsinB
Two-angle difference formula: sin(A-B) = sinAcosB-cosAsinB.
Double angle formula: sin2A = 2sinAcosA, cos2A = cos? Sin. a、tan2A = (2tanA)/( 1-tan? answer
Half-angle formula: sin (a/2) = sqrt [(1-COSA)/2]
Double angle formula:? sin3A = 3sinA - 4sin? a、cos3A = 4cos? A - 3cosA
Triple angle formula: sin3A = 3sinA-4sin? a、cos3A = 4cos? A - 3cosA
Universal formula: sin (ab) = SINA COSB COSA SINB COS (ab) = COSA COSB? Sina sinb tan(A B)=(tanA tanB)/( 1? tanAtanB)