化简tan5°+cot5°-2sec80°
问题描述:
化简tan5°+cot5°-2sec80°
答
化简为sin5°/cos5°+cos5°/sin5°-2/sin10=cos5^2+sin5^2/cos5sin5-2/sin10=1/cos5sin5-2/sin10=2/sin10/-2sin10=0
化简tan5°+cot5°-2sec80°
化简为sin5°/cos5°+cos5°/sin5°-2/sin10=cos5^2+sin5^2/cos5sin5-2/sin10=1/cos5sin5-2/sin10=2/sin10/-2sin10=0