Sign in
Please select an account to continue using cracku.in
↓ →
Expression : $$(cosA+sinA)^{2} +(cosA-sinA)^{2}$$
= $$(cos^2 A + sin^2 A + 2.sin A.cos A) + (cos^2 A + sin^2 A - 2.sin A.cos A)$$
= $$(1 + 2.sin A.cos A) + (1 - 2.sin A.cos A)$$
= $$1 + 1 = 2$$
=> Ans - (C)
Create a FREE account and get: