Jack wrote the number [tex]$4,325,000$[/tex] in scientific notation. Choose the answer that correctly shows his number in scientific notation.
(A) [tex]$4.325 \times 10^6$[/tex]
(B) [tex]$4.325 \times 10^{-6}$[/tex]
(C) [tex]$4.325 \times 10^3$[/tex]
(D) [tex]$43.25 \times 10^4$[/tex]
Answer (2)
It's sine of 90-18, that is, sine of 72 degrees.
You can write cos ( 1 8 ∘ ) in terms of sine using the identity cos ( x ) = sin ( 9 0 ∘ − x ) , which gives us cos ( 1 8 ∘ ) = sin ( 7 2 ∘ ) .
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