F.4 MATHS

2012-04-01 12:48 am
sin(X-10)=-cos65

0<x<360


rationalize

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回答 (2)

2012-04-01 12:57 am
✔ 最佳答案
1) sin (x - 10) = - cos 65

cos [90 - (x - 10)] = - cos 65

cos (100 - x) = - cos 65

cos (x - 100) = - cos 65

x - 100 = 115 or 245 (Note: - 100 < x - 100 < 260)

x = 215 or 345

2) 4b/√(ab3)

= 4b/(a1/2b3/2)

= 4a-1/2b-1/2

3) xx √(2/xy)

= √2 xx-1/2 y-1/2
參考: 原創答案
2012-04-01 8:48 pm
後面兩題 "rationalize" 是要有理化(分母)。


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