Aspire Faculty ID #18387 · Topic: AMU MCA 2016 · Just now
AMU MCA 2016

The value of the expression $1 - \frac{\sin^2 y}{1+\cos y} + \frac{1+\cos y}{\sin y} - \frac{\sin y}{1-\cos y}$ is equal to

Solution

Use identities: $\frac{\sin^2 y}{1+\cos y} = 1-\cos y$ $\frac{\sin y}{1-\cos y} = \frac{1+\cos y}{\sin y}$ Terms cancel ⇒ result = $\cos y$ Final Answer: $\boxed{\cos y}$

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