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We want to find one-half of the reciprocal of 7/sqrt(98). Let's write down an expression for this:
We can rewrite 98 into
The square root of 49 is 7
This should be your answer. Let me know if you need any clarifications, thanks!
In the half-angle formula for sine and cosine, notice that a plus/minus sign appears in front of each radical (square root). Whether your answer is positive or negative depends on which quadrant the new angle (the half angle) is in
