Principle Of Mathematical Induction

Question
CBSEENMA11013794

Show that: tanθ. tan left parenthesis straight theta plus 60 degree right parenthesis plus tanθ tan left parenthesis straight theta minus 60 degree right parenthesis plus tan left parenthesis straight theta plus 60 degree right parenthesis tan left parenthesis straight theta minus 60 degree right parenthesis equals minus 3

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