Math, asked by Wisawapp, 10 months ago

cot9-cot27-cot63+cot81=

Answers

Answered by sreeh123flyback

1

Step-by-step explanation:

cot9-3cot9-7cot9-9cot9

cot9(1-3-7+9)

cot9(-3-7+9+1)

cot9(0)

0

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