Question

If sin 2a=cosa, then find the value of tana.​

Answer 1

Answer:

sin 2a = cos a

sin 2a = sin (90⁰- a)

2a = 90⁰- a

2a+a = 90⁰

3a = 90⁰

a = 90/3

a = 30⁰

$tan30 {}^{o} = \: \frac{1}{ \sqrt{3} }$

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