foo9008
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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 ?
Trigonometric equation for stress
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is the circled part wrong ?
how could 0.5 sin2theta = ( 1 + cos2theta ) / 2 ?
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It's a trig identity. Look up "Half-Angle" formulas:foo9008 said:Homework Statement
is the circled part wrong ?
Homework Equations
The Attempt at a Solution
how could 0.5 sin2theta = ( 1 + cos2theta ) / 2 ?
https://en.wikipedia.org/wiki/List_of_trigonometric_identities