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How do you find tan(-1) without a calculator?

Science & Mathematics by Anonymous 2018-06-05 11:01:35

Social Science

How do you find tan(-1) without a calculator?

3 answers

Please explain how to find tan(-1) without using a calculator. Thank you.

  • Anonymous

    tan(-1)= -tan(1)= -[ 1+1/3+2/15+17/315+62/2835+1382/155925...... = -1.55136764.... approximately.

  • Anonymous

    For the common angles, you should know that tan(π/6)= (1/2)/(√3 /2)= √3 /3, so arctan(√3 /3)= π/6; arctan(π/4)= 1 and so on.

  • Anonymous

    Unit circle or tables.

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