# How to prove that : tan 15°+tan 30°+tan15°.tan30° = 1 ??? can anyone please help here?

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by mshiv619

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by mshiv619

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putting,

tan(30° +15°)=(tan30° +tan15°)/(1 - tan30°.tan15°)

⇒tan(45°)=(tan30° +tan15°)/(1 - tan30°.tan15°)

⇒1=(tan30° +tan15°)/(1 - tan30°.tan15°)

⇒(1 - tan30°.tan15°) =(tan30° +tan15°)