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1. An expression for sin 25 cos 30+cos 25 sin 30 as a single function? 2. If cos A=3/4, then what is the value of

1. An expression for sin 25 cos 30+cos 25 sin 30 as a single function?

2. If cos A=3/4, then what is the value of cos 2A?

3. Simplify sin2x/2sinx

4. Simplify cos^2-cos2

5. Express the exact value of sin(/12) as a single fraction

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