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Mathematics, 20.05.2021 19:20 nathaniel12
Which of the following are identities check all that apply a. cos(x+y)-cos(x-y)=2cosxcosy b. sin(x+y)+sin(x-y)=2cosxsiny c. cos(x+y)+cos(x-y)=2cosxcosy d. tan(x-pi)=tanx
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Which of the following are identities check all that apply
a. cos(x+y)-cos(x-y)=2cosxcosy b. sin(x+...
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