how do you foil (2(1-sinx)(1+sinx))
how do you foil when theres a coefficient?
2 Answers By Expert Tutors
Certified High School AP Calculus and Physics Teacher
Use the difference of two square formula,
(2(1-sinx)(1+sinx)) = 2(1-sin^2 x) = 2cos^2 x
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Of course, you may FOIL, if you do not remember formula. But rational and faster way is to use the formula.
(a - b)(a + b) = a2 - b2
sin2x + cos2x = 1 --------> 1 - sin2x = cos2x
Rest is in the Robert's work ...........
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