Question

△ABC中,AB=3,AC=4,BC=5,AD⊥BC,DE⊥AC,求交ADE的4歌锐角三角函数值

Answer 1

由∠ADE=∠BAD=∠C,

∴sinC=BA/BC=3/5,

cosC=AC/BC=4/5,

tanC=AB/AC=3/4,

cotC=AC/AB=4/3.