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सिद्ध कीजिए की tan 15^(@) +tan 30^(@)...

सिद्ध कीजिए की
` tan 15^(@) +tan 30^(@) +tan 15^(@) tan 30^(@) =1`

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tan 75 ^(@) - tan 30^(@)- tan 75^(@) tan 30^(@) =1.

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