Answer:
n=10
a10= - 3 (2)^(10-1)= -3(2)^9
= -1536
Answer:
The cosine of the angle is 4/5.
Step-by-step explanation:
An acute angle is between 0º and 90º, in the first quadrant of the trigonometric circle, in which both the sine and the cosine are positive values.
For each angle
, we have that:

We have that:

So




The cosine of the angle is 4/5.
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<h3>✂----------------</h3><h3>hope it helps...</h3><h3>have a great day!!</h3>