4. the point ps0.5, 0d lies on the curve y − cos ? x. (a) if q is the point sx, cos ? xd, use your calculator to ind the slope of the secant line pq (correct to six decimal places) for the following values of x: (i) 0 (ii) 0.4 (iii) 0.49 (iv) 0.499 (v) 1 (vi) 0.6 (vii) 0.51 (viii) 0.501 (b) using the results of part (a), guess the value of the slope of the tangent line to the curve at ps0.5, 0d. (c) using the slope from part (b), ind an equation of the tangent line to the curve at ps0.5, 0d. (d) sketch the curve, two of the secant lines, and the tangent line.

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle

Ithink you’re answering is d