Sin 63+ Sin7
Cos17 +(08273
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Answer:
sin²63°+sin²73°÷cos² 17+cos²73°
sin²(90-27)+sin² 27°÷cos²(90-73) + cos² 73°
cos² 27° + sin² 27°÷sin² 73°+cos²73
1÷1
1
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