Ответ: tgα =-2
Объяснение:
cos α =1/√5 => sin²α =1-cos²α =1-1/5=4/5
-π/2<а<0 => sinα <0 => sinα=-2/√5
=> tgα =sinα/cosα =(-2/√5): (1/√5) =-2
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Ответ: tgα =-2
Объяснение:
cos α =1/√5 => sin²α =1-cos²α =1-1/5=4/5
-π/2<а<0 => sinα <0 => sinα=-2/√5
=> tgα =sinα/cosα =(-2/√5): (1/√5) =-2