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Mathematics, 14.12.2021 21:50 mell45
What is a double angle identity to find the exact value of cos?
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cos(2a)=〖cos〗^2(a)+〖sin〗^2(a)
cos(2a)=〖cos〗^2(a)
cos(2a)=2 〖cos〗^2(a)-1
cos(2a)=〖2cos〗^2(a)-2 〖sin〗^2(a)
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What is a double angle identity to find the exact value of cos?
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