Найдите tg α, если sin α = – 3/5 (три пятых) и α ∈(π; 3π/2)

Найдите наименьшее значение функции у = 3 sin х.

Решите неравенство методом интервалов (5-х) * (7-х) / (х+1) ≤ 0.
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