Question

2 cos^2 30-1=1-2sin^2 30​

Answer 1

Answer:

L.HS = RHS

Step-by-step explanation:

2*3/4-1=1-2*1/4

1/2=1/2

Answer 2

Answer:

2($cos^{2}30$) - 1 = 1 - ($sin^{2}30$)

     $\frac{1}{2} = \frac{1}{2}$

Step-by-step explanation:

$cos^{2} 30$ = $(\frac{\sqrt{3} }{2}) ^{2}$ = $\frac{3}{4}$

$sin^{2}30 = (\frac{1}{2} )^{2} = \frac{1}{4}$

so, 2($\frac{3}{4}$) - 1 = 1 - 2($\frac{1}{4}$)

       $\frac{3}{2} - 1 = 1 - \frac{1}{2}$

       $\frac{1}{2} = \frac{1}{2}$

Hence, Proved