SSC CHSL 7 Jan 2017 Shift 1 Paper

Question : 60 of 100

Marks: +1, -0

(cosA+sinA)^2 +(cosA-sinA)^2

is equals to

Solution:

Expression :

(cosA+sinA)^2

+(cosA-sinA)^2

(cos^2A+sin^2A+2.sinA.cosA)

+(cos^2A-sin^2A-2.sinA.cosA)

(1+2.sinA.cosA)

+(1-2.sinA.cosA)

= 1 +1 = 2

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