Find the value of A, given 2cos²A=1/2 when 0
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0.5given cos2value is substitute in upper equation
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2cos²A=1/2
cos²A=1/4
cosA=√1/4=1/2
cosA=1/2
cosA=cos60
A=60°.
cos²A=1/4
cosA=√1/4=1/2
cosA=1/2
cosA=cos60
A=60°.
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