Asked by Liz
prove or disprove cos(x-y)=cos(x)-cos(y)
Answers
Answered by
Damon
try x = y = 45 degrees
cos (45 - 45) = cos 45 - cos 45
cos 0 = 1/sqrt2 - 1/sqrt 2
1 = 0 no way :)
cos (45 - 45) = cos 45 - cos 45
cos 0 = 1/sqrt2 - 1/sqrt 2
1 = 0 no way :)
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