Question

( frac{sin 20+sin 40}{2 cos ^{2} 2 theta+cos 2 theta}=frac{sin 2 theta+sin 4 theta}{cos 2 theta(2 cos 2 theta+1)} )
che ( cos 40=2 cos ^{2} 2 theta-1 )
( longrightarrow )
( & sin 40=2 sin ^{200020} frac{sin 20+2 sin 20 cos 20}{cos 20(200510+1)} )
( swarrow )
( tan 2 theta=frac{sin 2 theta(1+2 cos 20)}{cos 20(1+2 cos 2 theta)} )
RIT give satugs

# The value of sin 20+ sin 40 ho is equal to + cos 20 + COS 40

Solution