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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 ?

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- Thread starter foo9008
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- #1

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is the circled part wrong ?

how could 0.5 sin2theta = ( 1 + cos2theta ) / 2 ?

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SteamKing

Staff Emeritus

Science Advisor

Homework Helper

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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 ?

https://en.wikipedia.org/wiki/List_of_trigonometric_identities

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