Mathematics
Senior High
Solved
次の直線がx軸の正の向きとなす角をもとめよ。
y=-x-5
解) 求める角をθとすると
tanθ=-1 θ=135°
この問題で、なぜ急にtanθ=-1になるのかが分かりません。教えてください🙇♀️
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