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Mathematics 23 Online
OpenStudy (anonymous):

Express (1-sintheta)(1+sintheta), in terms of costheta. (Use foil method to open parenthesis? Please help guys

OpenStudy (anonymous):

@RadEn

OpenStudy (raden):

first, use difference squares formula : (a+b)(a-b) = a^2 - b^2

OpenStudy (raden):

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