Show that tan 48° tan 23° tan 42° tan 67° = 1
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1
Step-by-step explanation:
= tan48.tan23.tan42.tan67
= tan48.tan23.tan(90-48).tan(90-23)
= tan48.tan23.cot48.cot23
= tan48.tan23.1/tan48.1/tan23
=1
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