1) tan - 2) cos 3) tan 105° 4) sin 5) sin 105° 6) tan 165° 13n 7) cos 12 8) tan 15° 9) cos 12 10) tan - 12 Simplify. tan -3x + tan 2x I) 1- tan -3atan 2x 12) cos Sucos -6u - sin Susin -6u 13) sin -xcos -3x - cos -xsin -3.x tan -4x + tan -3x 14) 1- tan -4xtan -3x 15) cos -4xcos -6x + sin -4xsin -6x 一

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