Question

Exe
Find the general solution of
1. sin 20 + cos 0 = 0)​

Answer 1

Answer:

$sin2x + cosx = 0 \\ 2sinxcosx \: + cosx = 0 \\ cosx(2sinx + 1) = 0 \\ so \: cosx \: = 0 \\ x = (2n + 1) \frac{\pi}{2} where \: n \: is \: integer \\ \\ also \: sinx \: = \frac{ - 1}{2} \\ sinx \: = sin( \frac{ - \pi}{6} ) \\ x \: = n\pi + ( { - 1)}^{n} \frac{ - \pi}{6} where \: n \: is \: an \: integer$

Answer 2

Answer:

this is correct.....................