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21. Seja \\alpha um número real satisfazendo 0 < \\alpha < \\frac{\\pi}{2}. Então, a soma de todos os valores de \\theta \\in [0, 2\\pi] que satisfazem a equação \\sin(\\theta) \\cos(\\theta) ( \\theta + \\alpha ) = \\sin(\\theta) é igual a

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