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If cos theta=-4/5 for theta in quadrant II, find sin theta/2

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half-angle-identity
double-angle

asked May 25, 2017 in GEOMETRY by anonymous

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1 Answer

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The trigonometric identity is

in second quadrant.

Consider right angle triangle,

Find

Trigonometric half angle property :

Substitute above values in trigonometric half angle property.

The value of

answered May 26, 2017 by Anney Mentor

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