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

JEE/Engineering Exams
Maths
Solution
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( 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
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