Question

2cos3thita=1 what is the thita?

Answer 1

$2\cos3( \alpha ) = 1 \\ \cos3( \alpha ) = \frac{1}{2 } - (1) \\ since \: \cos( 60 ) = \frac{1}{2} - (2) \\ on \: comparing \: (1)and(2) \\ therefore \: \\ 3 \alpha = 60 \: \\ \alpha = 20$

take alpha as theta because i did not have theta in my keyboard

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