Homework Sourseenter NO 2 cos301 My An Solution4 cos2 cos212 cos2 sin2 cos2
enter NO 2 cos(30)-1 My An 
Solution
4)
cos(2) =cos2()-(1/2)
=>cos2() -sin2() =cos2()-(1/2)
=>sin2() =(1/2)
=>sin() =(-1/2),sin() =(1/2)
=> =(k/2)-(/4)
=> =1.571k- 0.785
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5)
a)
2cos(3) =1
=>cos(3) =1/2
=>(3) =(2k)-(/3) ,(2k)+(/3)
=> =(2k/3)-(/9) ,(2k/3)+(/9)
=> =2.094k- 0.349 ,2.094k+0.349
b)
=0.349,1.745,2.443,3.840,4.538
