Use an addition or subtraction formula to find the exact value of
cos
(
−
π
12
)
\displaystyle {\cos{{\left(-{\frac{{\pi}}{{{12}}}}\right)}}}
cos
(
−
12
π
)
.
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Question 6
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\displaystyle
Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity
Decimal values are not allowed
Trig functions (sin,cos,etc.) are not allowed