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Q.

. It b > 1, sin t > 0, cost > 0 and logb⁡(sin⁡t)=x then logb⁡(cos⁡t) is equal to

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a

12logb⁡1−b2X

b

2log⁡1−bx/2

c

logb⁡1−b2x

d

1−x2

answer is A.

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Detailed Solution

logb⁡sin⁡t=x or sin⁡t=bxor  logb⁡(cos⁡t)=y, then by=cos⁡tor  b2y=cos2⁡t=1−sin2⁡t=1−b2xor  2y=logb⁡1−b2xor  y=12logb⁡1−b2x=logb⁡1−b2x
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