prove that, CoseØ= A²+1/A²-1
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Answer:
Given,
a⁴ + a² + 1 = (a⁴ + 2a² + 1) - a²
= (a² + 1)² - a²
We know that, a² - b² = (a + b)(a - b)
= (a² + 1 + a)(a² + 1 - a)
= (a² + a + 1)(a² - a+ 1)
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