tan 48degree tan23degree tan42degreetan67degree=1
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Step-by-step explanation:
tan 48 degree × tan 23 degree × tan 42 degree × tan 67 degree
= tan ( 90° - 42° ) × tan 42° × tan ( 90° - 67 ° ) × tan 67°
= cot 42 ° × tan 42 ° × cot 67 ° × tan 67 °
= 1 × 1 [ Since , tan theta × cot theta = 1 ]
= 1 [ Proved ]
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