prove that sin pi by 4 + theta sin of Pi by 4 minus theta equal to 1 by 2 cos 2 theta
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1 +sintheta+costheta/✓(2)+
2sintheta+costheta/✓(2)_ 1+
3 sintheta+ costheta/✓(2)max (sintheta+costheta)-sintheta+ costheta
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