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Trig identity question?

0 votes

The problem is 18-cos^2(84)-cos^2(6)
The answer is 17, but I don't understand why.
Thanks

trigonometric-identities

asked Apr 27, 2014 in TRIGONOMETRY by anonymous

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1 Answer

0 votes

The trig expression is

From the pythagoren identities

answered Apr 28, 2014 by david Expert

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