Answers
may be it can be none of these. because if we write the equation in quadratic expression in sin also we don,t get it.
over 10 years ago
Tejaswi
if you carefully observe this is a whole square equation.
let theta = x (for working simplicity)
sin^4 x - 2 sin^2 x - 1 = 0
=> (sin^2x-1)^2 = 0.
Hence sin^2x = 1 . now you can find the required value.
over 11 years ago
Lucky Kaul
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