Question 1098093
Use sum and difference identities to find the exact value of sin 15 degrees (two angles given are 45 degrees and 60 degrees.)
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Good idea.
Look up sum and difference identities.
Wikipedia covers it well.
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Use either 60 & 45, or 45 & 30 degrees.
I could do it, but I think the practice will benefit you more than it would me.