- Used to identify the presence of proteins?

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Help. Evaluate a^2+b for a=1/2 and b=-1/2
I know the answer is -1/4 but and 0.25 but why is it -1/4 should it be -1/2. Any help. Thanks? Let 0 be an angle in Quadrant 2 such that the cot 0= -3. Find the exact values for sin 0, cos 0, and tan 0? Use a half-angle formula to find the exact value of the expression.
cos 3pi/8? Solve equation on the interval [0,2pi)
csc^5 x - 4 csc x + 0? The exact value of 5.8 million times? Two point five thousand is.?