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Please help me solve this

Please help me solve this-example-1
User Patstuart
by
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1 Answer

3 votes

Answer:
(\pi)/(3)

Explanation:


sin(A+B)=sinAcosB+cosAsinB and
sin(A-B)=sinAcosB-cosAsinB

Applying these two rules into the equation, we can get a new equation


sin(x)cos((\pi)/(6))+cos(x)sin((\pi)/(6)) - [sin(x)cos((\pi)/(6))-cos(x)sin((\pi)/(6))] = (1)/(2)

We know
cos((\pi)/(6) ) = (√(3) )/(2) and
sin((\pi)/(6) ) = (1)/(2) so input this into the equation.


sin(x)((√(3))/(2))+cos(x)((1)/(2)) - sin(x)((√(3))/(2))+cos(x)((1)/(2)) = (1)/(2)

We can cancel out the terms
sin(x)((√(3))/(2) ) and 2 of
cos(x)((1)/(2)) make
cos(x), so all this make


cos(x) = (1)/(2)

So x is equal to
(\pi)/(3) in a fixed interval

User Lmarcelocc
by
3.3k points