Solution
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)
Get AI Help
Create a FREE account and get:
- Free SSC Study Material - 18000 Questions
- 230+ SSC previous papers with solutions PDF
- 100+ SSC Online Tests for Free
