mariaveliz2201
04.07.2019 •
Mathematics
Can someone explain how this answer was produced?
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Ответ:
Step-by-step explanation:
First, we know that the sin function is odd which means:
sin(-x) = -sin(x).
Secondly evaluating an inverse trigonometric function with a normal trigonometric function as the argument can be rewritten as an algebraic expression.
Let
We know the certain identity.
We use it to evaluate sin(11 pi / 4).
Another helping identity is the following:
But let's not forget that t = -sin(11 pi/4) = - sqrt(2) / 2
Now we end up with the following equation.
Ответ: