Cross multiply the expression so that we can get
(1+sinx)(1-sinx) = cos^2 x
1 - sin^2 x = cos^2 x
cos^2 x + sin^2 x = 1
since
cos^2 x + sin^2 x = 1
therefore
1 = 1
the two expressions are identical in a trigonometric sense
Value of the boat after 9 years= 12050*(1-0.12)^9
=$3814(correct to nearest integer)
5/1? Im not sure if i am right
