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What are the tangent and angle formulas?
The formula of tangent sum angle is tan (a+b) = (tana+tanb)/(1-tana * tanb), and the formula of double angle when A=B is tan2a = 2tana/( 1-2).
The sum (difference) formulas of two angles include sine formula, cosine formula and tangent formula. The sum and difference formula of two angles is the basis of invariant deformation of trigonometric function, and other formulas of trigonometric function are obtained based on this formula. tan(A+B)=(tanA+tanB)/( 1-tanA tanB).tan(A-B)=(tanA-tanB)/( 1+tanA tanB).
tan(A+B)= sin(A+B)/cos(A+B)= Sina cosb+cosa sinb/cosa cosb-Sina sinb .
The numerator and denominator are divided by cosAcosB(cosA is not equal to 0 and cosB is not equal to 0).
tan(A+B)= tanA+tanB/ 1-tanA tanB，tan(A-B)= tanA-tanB/ 1+tanA tanB .
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