Question

$tan(5) \times \tan(15) \times \tan(45 ) \times \tan(75) \times \tan(85)$
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Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

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tan5 × tan15 × tan45 × tan75 × tan85

= tan5 × tan(90-75) × tan45 × tan75 × tan(90-5)

= tan5 × cot75 × tan75 × cot5 × tan45

= tan5 × cot5 × cot75 × tan75 × tan45

= 1 × 1 × tan45

= tan45

= 1

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