What is tan x/2 sin x-3cos x?

 The expression tan(x/2) sin(x) - 3cos(x) can be simplified using trigonometric identities.

We'll start by using the identity tan(x/2) = sin(x)/(1 + cos(x)):

tan(x/2) sin(x) - 3cos(x) = sin(x)/(1 + cos(x)) * sin(x) - 3cos(x) (substituting tan(x/2) with sin(x)/(1 + cos(x))) = sin^2(x)/(1 + cos(x)) - 3cos(x) (multiplying numerator by sin(x)) = sin^2(x) - 3cos(x)(1 + cos(x)) / (1 + cos(x)) (combining terms with a common denominator) = sin^2(x) - 3cos(x) - 3cos^2(x) / (1 + cos(x)) (expanding the denominator) = sin^2(x) - 3(1 + sin^2(x)) / (1 + cos(x)) (using the identity cos^2(x) + sin^2(x) = 1) = -2sin^2(x) - 3 / (1 + cos(x)).

Therefore, the simplified expression is -2sin^2(x) - 3 / (1 + cos(x)).

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