Q. 30 A

# 0 ≤ x ≤ π a

Given:  We know,

sin2 x + cos2 x = 1

cos2 x = 1 – sin2 x      Since, cosx will be negative in second quadrant

So, We know,

cos 2x = 2 cos2 x – 1       Since,  So, We know,

cos 2x = 1 – 2 sin2 x       Since,  So, We know,   On rationalising:  { (a + b)(a – b) = a2 – b2}    Rate this question :

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