1. The problem statement, all variables and given/known data Given that 5sec^2+3tan^2 = 9 find sinx value 2. Relevant equations trig. identities 3. The attempt at a solution i started off by subbing. in sec2= 1+tan^2 => 5(1+tan^2)+3tan^2= 9 5+8tan^2x = 9 8tan^2 = 4 tan^2 = 1/2 <--- no idea of this bit, as i am supposed to find sin x value =/ , hmm i even wonder if this right.