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Mathematical equation formula
Two-angle sum formula

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-tanA tanB)

tan(A-B)=(tanA-tanB)/( 1+tanA tanB)

cot(A+B)=(cotA cotB- 1)/(cot B+cotA)?

cot(A-B)=(cotA cotB+ 1)/(cot b-cotA)

[Edit this paragraph] Double Angle Formula

Sin2A=2SinA? Kosa

cos2a=cosa^2-sina^2= 1-2sina^2=2cosa^2- 1

tan2A=2tanA/ 1-tanA^2

[Edit this paragraph] Triple angle formula

tan3a = tan a tan(π/3+a) tan(π/3-a)

[Edit this paragraph] Half-angle formula

[Edit this paragraph] Sum-difference product

sin(a)+sin(b)= 2 sin[(a+b)/2]cos[(a-b)/2]

sin(a)-sin(b)= 2cos[(a+b)/2]sin[(a-b)/2]

cos(a)+cos(b)= 2cos[(a+b)/2]cos[(a-b)/2]

cos(a)-cos(b)=-2 sin[(a+b)/2]sin[(a-b)/2]

tanA+tanB=sin(A+B)/cosAcosB

[Edit this paragraph] Sum and difference of products

sin(a)sin(b)=- 1/2 *[cos(a+b)-cos(a-b)]

cos(a)cos(b)= 1/2 *[cos(a+b)+cos(a-b)]

sin(a)cos(b)= 1/2 *[sin(a+b)+sin(a-b)]

cos(a)sin(b)= 1/2 *[sin(a+b)-sin(a-b)]

[Edit this paragraph] Inductive formula

sin(-a) = -sin(a)

cos(-a) = cos(a)

sin(π/2-a) = cos(a)

cos(π/2-a) = sin(a)

sin(π/2+a) = cos(a)

cos(π/2+a) = -sin(a)

sin(π-a) = sin(a)

cos(π-a) = -cos(a)

sin(π+a) = -sin(a)

cos(π+a) = -cos(a)

tanA= sinA/cosA

tan(π/2+α)=-cotα

tan(π/2-α)=cotα

tan(π-α)=-tanα

tan(π+α)=tanα

[Edit this paragraph] General formula

[Edit this paragraph] Other formulas

[Edit this paragraph] Other non-critical trigonometric functions

csc(a) = 1/sin(a)

Seconds (a)= 1/ cosine (a)

[Edit this paragraph] Hyperbolic function

sinh(a) = [e^a-e^(-a)]/2

cosh(a) = [e^a+e^(-a)]/2

tg h(a) = sin h(a)/cos h(a)

Formula 1:

Let α be an arbitrary angle, and the values of the same trigonometric function with the same angle of the terminal edge are equal:

sin(2kπ+α)= sinα

cos(2kπ+α)= cosα

tan(2kπ+α)= tanα

cot(2kπ+α)= cotα

Equation 2:

Let α be an arbitrary angle, and the relationship between the trigonometric function value of π+α and the trigonometric function value of α;

Sine (π+α) =-Sine α

cos(π+α)= -cosα

tan(π+α)= tanα

cot(π+α)= cotα

Formula 3:

The relationship between arbitrary angle α and the value of-α trigonometric function;

Sine (-α) =-Sine α

cos(-α)= cosα

tan(-α)= -tanα

Kurt (-α) =-Kurt α

Equation 4:

The relationship between π-α and the trigonometric function value of α can be obtained by Formula 2 and Formula 3:

Sine (π-α) = Sine α

cos(π-α)= -cosα

tan(π-α)= -tanα

cot(π-α)=-coα

Formula 5:

The relationship between the trigonometric function values of 2π-α and α can be obtained by Formula-and Formula 3:

Sine (2π-α)=- Sine α

cos(2π-α)= cosα

tan(2π-α)= -tanα

Kurt (2π-α)=- Kurt α

Equation 6:

The relationship between π/2 α and 3 π/2 α and the trigonometric function value of α;

sin(π/2+α)= cosα

cos(π/2+α)= -sinα

tan(π/2+α)= -cotα

cot(π/2+α)= -tanα

sin(π/2-α)= cosα

cos(π/2-α)= sinα

tan(π/2-α)= cotα

cot(π/2-α)= tanα

sin(3π/2+α)= -cosα

cos(3π/2+α)= sinα

tan(3π/2+α)= -cotα

cot(3π/2+α)= -tanα

sin(3π/2-α)= -cosα

cos(3π/2-α)= -sinα

tan(3π/2-α)= cotα

cot(3π/2-α)= tanα

(higher than k∈Z)

It took me a long time to input this common formula in physics, hoping it will be useful to everyone.

a sin(ωt+θ)+B sin(ωt+φ)= 1

√{(A^2 +B^2 +2ABcos(θ-φ)}? sin{ ωt + arcsin[ (A? sinθ+B? sinφ)/√{a^2 +b^2; +2ABcos(θ-φ)} }

√ indicates the root number, including the contents in {...}.