Which statement about 172° is correct?
A. sin 172° < 0
B. cos 172° < 0
C. tan 172° > 0

Statement B is correct.

Make sure that your calculator is in degree mode and input each statement to verify that cos172 is less than zero

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)