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Let a=cos 0^@ sin² 270^@ - 2 cos 180^@ t...

Let `a=cos 0^@ sin² 270^@ - 2 cos 180^@ tan 45^@b=3 sin 180^@ *sec 180^@ + 2 cosec 90^@ - cos 360^@c=2 sec^2 pi cos 0^@ + 3 sin^2 (3 pi)/2-cosec pi/2 and d= tan pi cos (3 pi)/2+ sec 2 pi - cosec (3 pi)/2`Find the value of `(a+b+c+d).`

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