SOLUTION: Can you help with equation; calculate exact value ; cos 105 degrees

Question 978087: Can you help with equation; calculate exact value ; cos 105 degrees
Found 2 solutions by MathLover1, Alan3354:
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

Use the formula,

Since and , we have

or

Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
That's not an equation.
Equations have equal signs.
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