Prove that: 1. tan35°tan40°tan45°tan50°tan55°=1
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tan35°tan40°tan45°tan50°tan55°=1
tan(90-55)tan(90-50)tan45tan55 =1
cot55cot50tan45tan50tan55 =1
1/tan55*1/tan50*tan55*tan45*tan50 =1
tan45*1 =1
1*1 =1
1=1
tan(90-55)tan(90-50)tan45tan55 =1
cot55cot50tan45tan50tan55 =1
1/tan55*1/tan50*tan55*tan45*tan50 =1
tan45*1 =1
1*1 =1
1=1
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