Recurrence relation of tangent

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SUMMARY

The discussion centers on deriving a recurrence relation for the tangent function, specifically for tan(nx) where n is a positive integer. The established formula used is the sum formula tan(A + B) = (tan(A) + tan(B)) / (1 + tan(A)tan(B)). By applying this formula, the recurrence relation is formulated as T(n+1) = (T(1) + T(n)) / (1 + T(1)T(n)), where T(n) represents tan(nx). This provides a systematic approach to compute tangent values for integer multiples of x.

PREREQUISITES
  • Understanding of trigonometric functions, specifically tangent.
  • Familiarity with recurrence relations in mathematics.
  • Knowledge of the tangent sum formula.
  • Basic algebraic manipulation skills.
NEXT STEPS
  • Explore the derivation of other trigonometric recurrence relations.
  • Study the properties of the tangent function in detail.
  • Learn about the implications of recurrence relations in numerical methods.
  • Investigate applications of tangent functions in calculus and physics.
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Mathematicians, students studying trigonometry, and anyone interested in the properties of trigonometric functions and their applications in various fields.

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Is it possible to find a recurrence relation of tan(nx) where n is a positive integer and x is a real variable?

My friend said that it is possible.

I don't see how to do it.

Does anyone have a way to do it?
 
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You should know the sum formula tan(A+ B)= (tan(A)+ tan(B))/(1+ tan(A)(tan(B)).

Using that, tan((n+1)x)= tan(x+ nx= (tan(x)+ tan(nx))/(1+ tan(x)tan(nx))
or, if we write Tn= tan(nx),

Tn+1= (T_1+ T_n)/(1+ T_1T_n), a recurrance relation.
 

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