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標題:
Maths唔識抵死題(new2)
發問:
8e) Solve the equations for 0
最佳解答:
is cos 2 y means (cos y)^2 ?? Here cos^2 y means (cos y )^2 Cos ^2 y + 3sin y +1 =0 1 - sin^2 y + 3sin y +1 =0 sin^2 y - 3sin y -2 = 0 ( sin y - 1 )( sin y -2 )=0 sin y =1 or siny = 2 ( reject, since -1
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其他解答:
the q should be cos 2 y + 3 sin y +1 =0 the ans = 210 degrees and 330 degrees, try again!!
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