Factorise the following expressions completely. For the answering , Leave space between a number and operational sign e.g x + 2
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1) a^{2 }– b^{2}
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2) c^{2 }– b^{2}
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3) 25^{2 }– a^{2}
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4) c^{2 }– 36^{2}
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5) x^{2 }– 49^{2}
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6) b^{2} – 25c^{2}
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7) x^{2} – 9
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8) 2x^{2} – 98
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9) 4x^{2} – 25
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10) 9x^{6} – y^{8}
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