Question

(15) यदि cosA +sinA =a हो तो cosA-sinA का मान होगा?

(a) √4-a²

(b) √4+a²

(c)√2-a²

(d)√2+a²​

exp.

ho gya, (cosA + cosA)² = a², cos²A + sin²A +2sinAcosA = a², 2sinAcosA = a²-1, now rhs (cosA - sinA)² = cos²A + sin²A - 2cosAsinA, 1 - 2cosAsinA, 1 -a² + 1, 2 - a² or √2 - a²

Answer 1

Answer:

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