Question

Tan2thita = 2 tan thita / 1 - tan^2 thita

Answer 1

tan square thita = 2 tan thita /1- tan square theta

= tan square theta= 2 tan thita / sec theta

= sin thita/ cos theta = 2( sin thita/ cos theta) / sec theta

= (tan thita.tan theta ) cancel

= 1- 2( sec theta )

= 1( sec theta)

= sec theta

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