Question

3cos^2x-2sin^2x=-0.75​

Answer 1

3cos^2x-2sin^2x=-0.75

=> 3(1 - sin²x) - 2sin²x= -0.75

=>3 - 5sin²x = - 0.75

=>3.75 = 5 sin²x

=>sin²x = 0.75 = 3/4

=> sine x =√3/2

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