evaluate tan 35degree tan 40degree tan45degree tan55degree
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tan35°×tan40°×tan45°×tan50°×tan55°
=tan35°×tan40°×tan45°×cot(90-50)°×cot(90-55)°
=tan35°×cot35°tan40°×cot40°×tan45°
=1×1×1=1
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