Question

Sin alpha / 1-cos alpha + Sin alpha /1+ cos alpha =4 Find the angle .....
plz help me​

Answer 1

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Step-by-step explanation:lpha = 30°

sin alpha [ (1+cos alpha) + sin alpha (1-cos alpha) ] ÷ 1-cos^2 alpha = 4

[ sin alpha ( 1+cos alpha + 1 - cos alpha ) ] ÷ sin^2 alpha = 4

*key : sin^2 alpha + cos^2 alpha = 1

1+1+ cos alpha - cos alpha = 4 sin alpha

2 = 4 sin alpha

1 = 2 sin alpha

sin alpha = ½

*alpha = 30°