Can you help me with these problems?

1 point Q Notice that the half-angle formulas for sine and cosine contain a square root in II II' their formulas. How do you know whether to use the "+" or - In these formulas when evaluating? 0 You can use either the "+\\/" or "'/" as both are correct when evaluating a square root. The sign depends on whether or not that trig function (sine or cosine) is positive or negative in the quad rant for the specic half-angle given. 0 Always use the positive square root "+\\/" when evaluating. Always use the negative square root " \\/"when evaluating. 1.5 points 9 Find a, b, and c. Note that the fraction is not simplied. 5r) = a+\\/l; sin ( 6 a= type your answer... b= type your answer... c= type you r a nswer... 1.5 points Find a, b, and c. Note that the fraction is not simplied. cos(77r) = m F c a= type your answer... b= type your answer... type you r answer... 1 point If sin 9 = % and 9 is in Quadrant IV, nd cos (29). cos (29) = : a= type your answer... b= type your answer... 2 points Fill in the blanks. Do not rationalize. 5_'rr _ a+\\/5 tan(12 ya+d type your answer... d= type your answer... a 1.5 points Fill in the blanks. Do not rationalize. sin (lg7') = L (\"L5 12 a= type your answer... b= type your answer... c= type your answer... 1.5 points Fill in the blanks. Do not rationalize. Note: a.