Without using a calculator, determine the exact surd value of sin 7π/6?
回答 (2)
2018-06-04 6:41 pm
sin(7π/6)
= sin[π + (π/6)]
= -sin(π/6) …… sin(7π/6) is negative because the angle is in the third quadrant.
= -1/2
= sin[π + (π/6)]
= -sin(π/6) …… sin(7π/6) is negative because the angle is in the third quadrant.
= -1/2
2018-06-04 6:40 pm
sin 7π/6 = sin (6π/6 + π/6)
= sin (π + π/6)
= -sin π/6
= - 1/2
= sin (π + π/6)
= -sin π/6
= - 1/2
收錄日期: 2021-04-24 01:05:44
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https://hk.answers.yahoo.com/question/index?qid=20180604100321AAXSdeU