Which trigonometric identity is INCORRECT? A: sin^2 x + cos^2 x = 1

B: tan x = (sin x)/(cos x)

C: sin x = 1/(csc(x))

D: tan^ 2 x 1 sec^ 2 x​

Answer to your question: a. the fundamental theorem of algebra tells you that the equation will have two complex roots since the degree of the polynomial is 2. the roots are ​ x=1±i7√2 .number of roots=degree of polynomialhere, degree of polynomial is 2 so number of roots will be 2.hope it *_*