Simplify the following expression by using identities. \(\frac{{{{\sin }^2}{\rm{x}} - 1}}{{\sin {\rm{x\;}} + {\rm{\;}}1{\rm{\;}}}}\)

Simplify the following expression by using identities.

\(\frac{{{{\sin }^2}{\rm{x}} - 1}}{{\sin {\rm{x\;}} + {\rm{\;}}1{\rm{\;}}}}\)

1). sin x
2). cosx
3). -1 + sin x
4). 1 - cosx

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