求值 1/cos100°^2-3/cos100°^2

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求值 1/cos100°^2-3/cos100°^2
求值 1/cos100°^2-3/cos100°^2

求值 1/cos100°^2-3/cos100°^2
1/(cos100°)^2-3/(cos100°)^2
=(1-3)/(cos100°)^2
=-2/(cos100°)^2
=-2/(-0.17365)^2
=-2/0.03015
=-66.3269