Prove that cos2 75-cos2 15=-3 _2
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Step-by-step explanation:
cos 2a- cos 2b form
cos 2×75-cos2×15
cos 150 -cos 30
cos 90+60 - cos30
psince {cos 90+©=sin © formula}
sin60 - cos 30
√3/2 -√3/2
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