Precalculus

I have three questions on my homework in which I am stuck on. Thanks
for the help!
#1
find all solutions of the equation in the interval [0,2pie). In cases
where a calculator is necessary, round the answers to two decimal
places.
sin(sinx)=pie/6
#2
A 100 ft vertical antenna is on the roof of a building. From a point on
the ground, the angles of elevation to the top and the bottom of the
antenna are 51 degrees and 37 degrees, respectively. Find the height of
the building.
#3
the length of the three sides of a triangle are denoted a, b, and c;
the angles opposite these sides are A,B, and C, respectively. In each
exercise, use the given information to find the required quantities.
c=4, a=2, B=90 degrees
find sin^2(A) + cos^2(B)

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