Need a little help and thanks.

(3) Explain how to nd the a: coordinate of B in the piston motion set up with rst rod length 1 and second rod length 3. Explain if the functions f (:0) = i and g(:c) = cossc have inverses. State the inverses if they exist. What property must a function have in order to have an inverse? Explain how to simplify cos(9) and sin(9). How can this knowledge be used to derive the formula for cos(A+ B) if you are given the formula cos(A B) = cos A cos B -| sin A sin B? Explain why sin(9+90) = cos 6' using the angle sum formulas. Explain why sin(0+90) = cos 6 using transformations of graphs. Explain how to solve the SAS triangle with c = 10, A = 36", b = 5. Is there only one way to solve this triangle, or may you solve for the elements in another order, or using different tools? Give three examples of SSA triangles: one which has no solution, one which has one solution, and one which has two solutions. Explain why you know the number of solutions in each of your examples. Explain how to nd the value of S = 1 + 2 + 3 + + (m 1) + m. How many 4-letter words can be spelled with 'a', 'b', 'c', 'd'? How many 4-1etter words can be spelled using 'x', 'x', 'x', 'y'? Explain the relationship between your two answers