Question

Rewrite the expression as an algebraic function of x and y. cos(sin−1 x − tan−1 y)

Answer 1

use angle sum formula

Answer 2

cos(A-B) = cosAcosB + sinAsinB

Answer 3

how do I do that?

Answer 4

\(\cos(\sin^{-1}x - \tan^{-1}y) = \cos(\sin^{-1}x) \cos (\tan^{-1}y) + \sin(\sin^{-1}x) \sin(\tan^{-1}y) \)

Answer 5

you need to draw two triangles

Answer 6

why do i need to draw two triangles?

Answer 7

good question :)
cuz u have two different variables