 Hello friends and how are you all doing today? My name is Priyanka and the question says evaluate the following here We need to evaluate sign 60 degree multiplied by cos 30 degree plus sign 30 degree Multiplied by cos 60 degree now before proceeding on with the solution We should be well versed with the table 8.1 in which we know the values of different trigonometric ratios What we need to do in this class is we will be learning all these values and We will be substituting the values one by one for example. We have to Now substitute the value sign 60 degree. So sign 60 degree will be Root three by two cos 30 degree will be root three by two Sign 30 degree is one by two and cos 60 degree is one by two So now we will be substituting all these values over here We have sign 60 degree cos 30 degree plus sign 30 degree cos 60 degree let us substitute the values Root three by two into root three by two plus one by two into one by two So they're equal to three by four plus one by four which is equal to four by four Simplifying we have the answer to the First part as one so this is the required answer to the session Hope you understood the whole process well Do remember these values as you will be substituting them and using it in various questions Take care of your calculations and see you next