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If cos A= -4/5 and A is in the second quadrant, then cos 2A = ?

If cos A= -4/5 and A is in the second quadrant, then cos 2A = ?
asked 120k views
2 votes
If cos A= -4/5 and A is in the second quadrant, then cos 2A = ?

asked
User Joeyjoejoejr
by
8.1k points

1 Answer

3 votes

Answer:

i think its second pythagreom therom

Explanation:

because

answered
User Sachin Kanungo
by
7.8k points
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