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Tan formula
The formula of tanα formula is: tanα=y/x (opposite side/adjacent side)

Related knowledge:

All Tan's recipes are:

Half angle formula.

tan(α/2)= sinα/( 1+cosα)=( 1-cosα)/sinα.

Double angle formula.

tan2α=(2tanα)/( 1-tanα^2)。

Power reduction formula.

tan^2(α)=( 1-cos(2α)/( 1+cos(2α)。

General formula.

tanα=2tan(α/2)/.

Sum and difference formula of two angles.

tan(α+β)=(tanα+tanβ)/( 1-tanαtanβ).

tan(α-β)=(tanα-tanβ)/( 1+tanαtanβ).

Sum and difference product formula.

tanα+tanβ= sin(α+β)/cosαcosβ= tan(α+β)( 1-tanαtanβ).

tanα-tanβ= sin(α-β)/cosαcosβ= tan(α-β)( 1+tanαtanβ).