Упростить А) sin2a/sina -sin(pi/2+a)

Question

Упростить А)
sin2a/sina -sin(pi/2+a)

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Answer 1

Sin2a = 2 sina*cosa
sin(pi/2+a) = cosa
sin2a/sina - sin(pi/2+a) = 2sina*cosa/sina - cosa =2cosa-cosa = cosa