1.

The value of cos 2a/(1 - sin 2a) is01tan atan(45° + a)

Answer»

ANSWER:

COT( A - B)

= ( COTA cotB+1)/(cotB-cotA)

Now,

LHS = cot( 45 - A) =

= ( CotAcot45° + 1)/( cotA - cot45)

= ( CotA +1)/( cotA - 1)

= ( CosA/sinA +1)/( cosA/sinA - 1)

= (CosA+sinA)?/(cosA+sinA)(COSA-sinA)

= (cos?A+sin A+2sinAcosA)/(cos A-sin? A)

= (1 + 2sinAcosA) / cos2A

= (1 + sin2A ) /cos2A

I hope this helps you:)

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