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If sinx=.42, calculate the value of cos x?

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The sinus and cosinus have fixed values depending on the degrees they're applied for, so first we have to figure out how much is the x:

sin x = 0'42
x = arc sin 0'42
x = 24,83º

Now, if we wanna get the cos x, we just have to calculate cos 24'83, which would be 0,91.
User Hazem
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