13 points pls help me quick
2 answers:
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We can use following formula
Now, we need to find sin(2A).
Because, the angle A is in the 1st quadrant, and cos(2A) is negative, that means that the angle 2A is in the 2nd quadrant and sin(2A) is a positive number,so sin(2A) = 4/5.
sin(2A) = 4/5
cos(2A) = -3/5
Now, we need to find sin(2A).
Because, the angle A is in the 1st quadrant, and cos(2A) is negative, that means that the angle 2A is in the 2nd quadrant and sin(2A) is a positive number,so sin(2A) = 4/5.
sin(2A) = 4/5
cos(2A) = -3/5
