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Grade: 11 
        
7sin2x + 3cos2x = 4, solve for x.
3 years ago

Answers : (1)

Latika Leekha
askIITians Faculty
165 Points 
							Hello student,
 7sin2x + 3cos2x = 4
So, 4sin2x + 3sin2x + 3cos2x = 4
4sin2x + 3 (sin2x + cos2x) = 4
4sin2x + 3(1) = 4
4sin2x = 4 – 3
4sin2x = 1
sin2x = ¼
sin x = ½
So, x = 30 degree.
3 years ago
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