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Homework Statement
is the circled part wrong ?
Homework Equations
The Attempt at a Solution
how could 0.5 sin2theta = ( 1 + cos2theta ) / 2 ?
It's a trig identity. Look up "Half-Angle" formulas:Homework Statement
is the circled part wrong ?
Homework Equations
The Attempt at a Solution
how could 0.5 sin2theta = ( 1 + cos2theta ) / 2 ?