Find the value of \tan 4^\circ \tan 43^\circ \tan 47^\circ \tan 86^\circ

RRB Junior Engineer Stage 1 Model Papers 5

Question : 6 of 100

Marks: +1, -0

Find the value of

\tan 4° \tan 43° \tan 47° \tan 86°

Solution:

\tan 4° \tan 43° \tan47° \tan 86°

\tan (90° – 86°) × \tan (90° – 47°) × \tan 47° × \tan 86°

⇒\cot 86° × \cot 47° × \tan 47° × \tan 86°

⇒ 1

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