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Solution
Expression : tan 4° tan 43° tan 47 tan 86°
$$\because$$ $$tan(90-\theta) = cot\theta$$
=> $$tan 4^{\circ} = tan(90^{\circ}-86^{\circ}) = cot 86^{\circ}$$
Similarly, $$tan 43^{\circ} = cot 47^{\circ}$$
=> $$(cot 86^{\circ} \times tan 86^{\circ}) * (tan 47^{\circ} \times cot 47^{\circ})$$
Using, $$tan\theta cot\theta$$ = 1
=> 1*1 = 1
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