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Blue circle is the doubt

Blue circle is the doubt 

Question Image
Grade:12

1 Answers

noogler
489 Points
5 years ago
substitute x=(pie/2)1/2 in 2x2+pie/2
fl(2x2+pie/2)=fl(2(pie/2)+pie/2)=fl(pie+pie/2)
substitute in fl(x)=sinx+sin4x-cosx
                 fl(pie+pie/2)=-sin(pie/2)+sin(6pie)+cos(pie/2)=-1

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