 Hi and how are you all? The question says evaluate. The following we need to evaluate to tan square 45 degree plus cos square 30 degree minus sin square 60 degree. So here in this question we should be knowing the values of tan 45 degree cos 40 degree and sin 60 degree. These values will be taken up from the table 8.1. Here we have tan 45 degree as 1 cos 30 degree as root 3 by 2 and sin 60 degree again as root 3 by 2. So we have tan 45 degree as 1 cos 30 degree as root 3 by 2 and sin 60 degree again as root 3 by 2. So we need to evaluate to tan square 45 degree plus cos square 30 degree minus sin square 60 degree. This is equal to 2 into 1 square plus root 3 by 2 square minus root 3 by 2 square. These will get cancelled out. We are left with 2 into square root 1 which is 1 and the answer to the second part is 2. So if you understood the process well, do take care of writing these values. Remember them well and have a nice day.