1/2=4/8. 3 and 4/8+ 3 and 3/8 is 6 and 7/8.
Just plug in 3 for n and then 5 for n to see if an turns out to be 10 and 26.
n=3:
A) an = 8*3+10 = 34
B) an = 8*3 - 14 = 10 OK
C) an = 16*3+10 = 58
D) an = 16*3 - 38 = 10 OK
n=5:
B) an = 8*5-14 = 26 OK
D) an = 16*5 - 38 = 42
So the answer is B
Answer:
There is nothing to multiply.
You draw the reference angle of 45° but clockwise. The exact value of sin(-345°) is 1/√2.
