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OpenStudy (anonymous):
Express (1-sintheta)(1+sintheta), in terms of costheta. (Use foil method to open parenthesis? Please help guys
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OpenStudy (anonymous):
@RadEn
OpenStudy (raden):
first, use difference squares formula : (a+b)(a-b) = a^2 - b^2
OpenStudy (raden):
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