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You will see that I already have the answer - I need help understanding the method and steps used to simplify the expression. Please explain

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You will see that I already have the answer - I need help understanding the method and steps used to simplify the expression.

Please explain step-by-step the methods used.

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EXAMPLE 5 Using a Half-Anglo Formula to Find an Exact 1lil'aluia Find the exact value of cos 1115". 225 Solution Because 112.5\" 2 2 , we use the half-angle formula for cos; with a: = 225\". What sign should we use when we apply the formula? Because 112.5\" lies in quadrant I], where only the sine and cosecant are positive, cos 112.5\"

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