Consider the function f0==cohwn . l. 2. 3. What is the domain of this function? What do you think its range is? (Hint: Think about what we are putting in and what the final output is performed by.) Find the equation of the tangent line to the curve y==f at the point hay): (L1). Is the curve y==fh0 concave up or concave down at m==1 ? Without using a calculator or technology, decide whether f is increasing or decreasing at w==e . (Hint: You want to use your knowledge of the sine function to help you.)