Question

Find cos x if sin^2x-1/cos x = -1 a. –1 b. 2 c. 1 d. 0

Answer 1

C

Explanation:

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Answer 2

Answer: 1

Explanation:

Alright, lets get started.

The given expression is :

`(sin^2x-1)/(cosx)=-1`

As per Pythagorean identity,

`sin^2x + cos^2 x = 1`

taking 1 to left side and
`cos^2 x` to right side

`sin^2 x-1=-cos^2x`

Now plugging the value of
`sin^2 x-1` in given expression

`(-cos^2x)/(cosx) =-1`

cosx will be cancelled, so

`-cosx=-1`

Multiplying -1 in both sides, it will equal to

`cos x= 1` ........................ Answer (C)

Hope it will help :)