2sin( x + 15°)cos( x - 15°) = 1
有冇人知點做=.=..
更新1:
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F.4 A.Math 題
2009-02-13 6:22 am
Solve the following equations for 0° <= x <360°.
2sin( x + 15°)cos( x - 15°) = 1
有冇人知點做=.=..
2sin( x + 15°)cos( x - 15°) = 1
有冇人知點做=.=..
回答 (2)
2009-02-13 8:49 am
2009-02-13 6:28 am
2sin(x+15°)cos(x - 15°) = 1
therefore
one of them must equal 1
cos 0°=1
therefore x=15°
therefore
one of them must equal 1
cos 0°=1
therefore x=15°
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