cos10°-√3sin10°/sin10°cos10°
=4* (1/2)cos10°-(√3/2)sin10°/2sin10°cos10°
=4* sin30°cos10°-cos30°sin10°/2sin10°cos10°
=4* sin(30°-10°)/sin20°
=4* sin20°/sin20°
=4
cos10°-√3sin10°/sin10°cos10°
=4* (1/2)cos10°-(√3/2)sin10°/2sin10°cos10°
=4* sin30°cos10°-cos30°sin10°/2sin10°cos10°
=4* sin(30°-10°)/sin20°
=4* sin20°/sin20°
=4