化简:sin²αsin²в+cos²αcos²в-1/2cos2αcos2в
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化简:sin²αsin²в+cos²αcos²в-1/2cos2αcos2в
化简:sin²αsin²в+cos²αcos²в-1/2cos2αcos2в
化简:sin²αsin²в+cos²αcos²в-1/2cos2αcos2в
1/2cos(α—β)﹣1/2sin﹙α+β﹚