Steps to get the answer for same previous type 2 but with different Method 1. Analyse the standard formula well. 2. write down the value of angle ,which is with variable X or any other variable if mentioned . 3. Here if you observe you will get "a, b, c & d" are the angles with X ( SEE FORMULA ) 4. Now add "a & b" & "c &d" & subtract "a & b" & "c &d" & next take product of addition & subtraction part & divide both of them like ( a - b)(a + b) /( c - d) (c + d) & so the result .