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If cos A = 4/5 for angle A in Quadrant ii, find tan 2A

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double-angle

asked May 25, 2017 in TRIGONOMETRY by anonymous

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1 Answer

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The trigonometric identity is

A in second quadrant.

Consider right angle triangle,

Find

Trigonometric property :

Substitute above values in trigonometric property.

The value of

answered May 26, 2017 by Anney Mentor

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