Patrick B. answered 05/02/20
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Math and computer tutor/teacher
(sin^2)(sin^2) - cos^4 + cos^2 =
(1 - cos^2)(1 - cos^2) - cos^4 + cos^2 =
1 - 2cos^2 + cos^4 - cos^4 + cos^2 =
1 - cos^2
sin^2