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tan20°tan35°tan45°tan55°tan70°=1 |
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Answer» tan35° tan55° tan20° tan70° tan45°=tan(90-55)tan55° tan(90-70)tan70° tan45 next step =cot55°tan55°cot70°tan70°tan45 next is cot55=1/tan55,cot70=1/tan70 , tan45=1next= we cancel 1/tan55 by tan55 and 1/tan70 by tan 70 next all 1×1×1×1×1=1 Put the values |
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