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If sintheta1-sintheta2=a a n d costheta1...

If `sintheta_1-sintheta_2=a a n d costheta_1+costheta_2=b ,` then (a)`a^2+b^2geq4` (b) `a^2+b^2lt=4` (c)`a^2+b^2geq3` (d) `a^2+b^2lt=2`

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