If a=cos^2((3pi)/8+theta)-sin^2(pi/8-the...

If `a=cos^2((3pi)/8+theta)-sin^2(pi/8-theta), b=sin(290^@-theta)cos(160^@+theta)+cos(290^@-theta)sin(160^@+theta)` and `c=os200^@cos160^@-sin200^@sin160^@` then find the value of `a+b+c`

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