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Question
Evaluate: (tan 23°) × (tan 67°)
Evaluate
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Solution
tan 23° × tan 67°
= tan 23° × tan (90° – 23°) ...[∵ tan (90° – θ) = cot θ]
= tan 23° × cot 23°
= `tan 23^circ xx 1/(tan 23^circ)`
= 1
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