Question

Derivative of tan(x/2) from the first principle

Answer 1

• first memorise the formulas of trigonometry and limits
• now some formulas that I have used I am listing them

FROM LIMITS

1. lim x ---> 0 tanx /x = 1

FROM TRIGONOMETRY

1. 1+tan^2 x= sec^2x
2. tan(a+b) = (mentioned in the ans)

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answered by SANJANA MISHRA