sin x -1=0
sin x = 1
At this point, you can draw a sketch of a sine graph - the wave function starting at 0 going to one at 90 degrees, down to 0 at 180 degrees, -1 at 270 degrees back to 0 at 360 degrees.
Here is a diagram of one.
http://www.wsd1.org/waec/math/Pre-Calculus%20Advanced/Trigonometry/Graphing/images/sinxbasic.gif
as sin x = 1, u read from the graph where the graph is 1 -> at 90 degrees.
Alternatively u can use inverse sine function on your calculator for 1 to get 90. However this can cause difficulties if the graph is not a simple sine graph on its own, or if the domain is larger than 0
2007-12-12 13:31:29
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answer #2
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answered by Orienteer 1
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