Toán Lớp 11: Giải các pt sau
$a, tan^{7}x + cot^{7}x = tanx + cotx$
$b, 3(tanx – cotx) + tan^{2}x + cot^{2}x = 6$
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Toán Lớp 11: Giải các pt sau
$a, tan^{7}x + cot^{7}x = tanx + cotx$
$b, 3(tanx – cotx) + tan^{2}x + cot^{2}x = 6$
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