化简:(sin^2α-tan^2α)/(sin^2α·tan^2α)
问题描述:
化简:(sin^2α-tan^2α)/(sin^2α·tan^2α)
答
(sin²α-tan²α)/(sin²α·tan²α)
=(sin²α-sin²α/cos²α)/(sin²α·sin²α/cos²α)
=(sin²α*cos²α-sin²α)/(sin²α·sin²α)
=(cos²α-1)/sin²α
=-sin²α/sin²α
=-1