IB MAI HL Geometry & Trigonometry Topic 3.4 Trigonometric Functions (id: 52e76ef

本题目来源于试卷: IB MAI HL Geometry & Trigonometry Topic 3.4 Trigonometric Functions，类别为 IB数学

[问答题]
Let tanθ=r, for $\frac{π}{2}​$<θ<$π$, where r is a negative constant.
Express in terms of r:
1.cosθ;
2.sinθ.

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