- #1
ibysaiyan
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Homework Statement
Given that 5sec^2+3tan^2 = 9
find sinx value
Homework Equations
trig. identities
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.