Is tan 20°=k,then tan250°+ tan340°÷tan200°-tan110°
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Step-by-step explanation:
tan 250°+ tan 340°÷tan 200°-tan 110° = tan 70°- tan 20°÷ tan 20°+ tan 70°
= cot 20°- tan 20°÷ tan 20°+ cot 20°
= 1/k - k ÷ 1/k + k = 1 - k² ÷ 1 + k²
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