I need help trying to determine what number is suppose to be in place for alpha? I do not understand how they came up with Cos = 1/4 in question (d).
Sin(90 deg - alpha) = Cos alpha = 1/4
http://i333.photobucket.com/albums/m...g?t=1221333118
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I need help trying to determine what number is suppose to be in place for alpha? I do not understand how they came up with Cos = 1/4 in question (d).
Sin(90 deg - alpha) = Cos alpha = 1/4
http://i333.photobucket.com/albums/m...g?t=1221333118
Hello,
can be checked on a unit circle.
Otherwise, use this formula :
So here
The red parts are supposed to be known (Wink)