If sina+sinb=x,
cosa+cosb=y,
prove that cos(a-b)=(x^2-y^2)/(x^2+y^2)...
Mathematics, 10.11.2020 14:00 jamaiciaw6
If sina+sinb=x,
cosa+cosb=y,
prove that cos(a-b)=(x^2-y^2)/(x^2+y^2)
Answers: 2
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