1.cosπ/3-tan9π/4+3/4tan²(-2π+π/6)+sin25π/6-cos²13π/6+sin17π/2 2.a,b,c为正数3的a次方=4的b次方=6的c次方证:2/a+1/b=2/c 3.sinx+cos+x=1/5(0<x<π)求tanx
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1.cosπ/3-tan9π/4+3/4tan²(-2π+π/6)+sin25π/6-cos²13π/6+sin17π/2 2.a,b,c为正数3的a次方=4的b次方=6的c次方证:2/a+1/b=2/c 3.sinx+cos+x=1/5(0<x<π)求tanx
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