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Step-by-step explanation:
tan 48⁰ tan 23⁰ tan 42⁰ tan 67⁰
= tan 48⁰ tan 23⁰ tan (90-48)⁰ tan (90-23)⁰
= tan 48⁰ tan 23⁰ cot 48⁰ cot 23⁰
= tan 48⁰ tan 23⁰ 1/tan 48⁰ 1/tan 23⁰
= 1
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