摘要：Remember how we said that sin⁻¹, cos⁻¹ and tan⁻¹ aren’t quite the same as 1/sin, 1/cos and 1/tan? Here’s why…
Remember how we said that sin⁻¹, cos⁻¹ and tan⁻¹ aren’t quite the same as 1/sin, 1/cos and 1/tan? Here’s why…
来源：安娜说留学
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