The given trigonometric equation is .
Compare the general graph equation: , So k = 2.
Then k > 0 the cosine graph is translated vertically 2 units upward.
The translated vertically 2 units upward.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=017ecc4498700a47a40ef26a5b0cf3ba.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2678fc8aa553c68f497c309784aa003b.png\")
, So k = 2.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")