Yes it is true:
(1 - cos^2 x) = sin^2 x Sqr.(1 - cos^2 x) = sin x and (-sinx) True, since sin x negative. Also, x terminates in quadrant 3 and 4. Hope this is helpful
They are similar triangles because they are both right triangles
$1040.00
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Raphael paid $624
624/.60= 1040.00
Seven and Seventy-Five Hundredths
