证明tan^2α-cot^2α/sin^2α-cos^2α=sec^2α+csc^2α_数学解答

证明tan^2α-cot^2α/sin^2α-cos^2α=sec^2α+csc^2α

人气：484 ℃　时间：2019-10-31 08:27:51

解答

(tan²a-cot²a)/(sin²a-cos²a)=(sin²a/cos²a-cos²a/sin²a)/(sin²a-cos²a)=(sin^4a-cos^4a)/sin²acos²a(sin²a-cos²a)=(sin²a-cos²a...