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​

Shelly bought a house five years ago for $150,000 and obtained an 80% loan. now the home is worth $140,000 and her loan balance has been reduced by $12,000. what is shelly's current equity?