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1a.       2 sin^2 x - 1 = 0

Answer: x = 45°, 135°, 225°, 315° ?

 

 

3a.      2 sin^2 x + sin x = 1

 

 

5a.      2 sin^2 x + 7 sin x = 4

 Apr 28, 2019
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https://www.symbolab.com/solver/equation-calculator/%5Csin(2x)+%5Csin(x)=0,0%3C=x%3C=360

 Apr 29, 2019

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