第四题怎么算呢?
1个回答
2017-10-13
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(4)
3/14 -(3/7)[cos(5π/12)]^2
=3/14 -(3/14)[cos(5π/6) +1 ]
=3/14 -(3/14)(-√3/2 +1 )
= 3√3/28
3/14 -(3/7)[cos(5π/12)]^2
=3/14 -(3/14)[cos(5π/6) +1 ]
=3/14 -(3/14)(-√3/2 +1 )
= 3√3/28
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