The answer would be A. Make sure you also use BEDMAAS, and take care of the brackets first
The exact value for cos(pi/16) would be :
cos (pi/16) = +/- √1+cosa/2
cos (pi/4) = sqrt2/2
Hope this helps
Answer:
a₁₂ = - 4194304
Step-by-step explanation:
the nth term of a geometric sequence is
= a₁
where a₁ is the first term and r the common ratio
here a₁ = 1 and r = = - 4 , then
a₁₂ = 1 × = - 4194304