(sin15°cos25°-sin40°)/(cos15°cos25°-cos40°)

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(sin15°cos25°-sin40°)/(cos15°cos25°-cos40°)(sin15°cos25°-sin40°)/(cos15°cos25°-cos40°)(sin15°cos25°-

(sin15°cos25°-sin40°)/(cos15°cos25°-cos40°)
(sin15°cos25°-sin40°)/(cos15°cos25°-cos40°)

(sin15°cos25°-sin40°)/(cos15°cos25°-cos40°)

-cot15°