How do I find the exact value of an expression like this one? u=sin(x+pi/4) when sin(x)= 1/3 and x is in the range 0-90 degrees. Thanks.
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Originally Posted by Prove It . Yeah, that’s what I thought, but what should I do when I have this? u=(√2/2)sin(x) + (√2/2)cos(x)
You know that . You should also know that from the Pythagorean Theorem. That means .
Allright! Got it now. I assume you mean: cos(x)=√1-cos^2(x) Which makes: cos(x)=√8/3 not √10/3 That gave me the right answer. Thanks!
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