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tan60°+2tan45°—2cos30=√3+2×1-2×(√3×1/2)=√3+2-√3=2就是要記住各度數的相應三角函數值.sin cos tan0 0 1 030 1/2√3/2√345 1/√2 1/√2 160√3/2 1/2 1/√390 1 0∞(無)注:√3/2代表2分之根號…
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