高数,函数极限,求解
2016-10-23
展开全部
(x→π/2) lim (tan²x-sec²x)
= (x→π/2) lim (sin²x/cos²x - 1/cos²x)
= (x→π/2) lim (sin²x-1)/cos²x
= (x→π/2) lim (-cos²x/cos²x)
= -1
= (x→π/2) lim (sin²x/cos²x - 1/cos²x)
= (x→π/2) lim (sin²x-1)/cos²x
= (x→π/2) lim (-cos²x/cos²x)
= -1
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