Cos230+
Cas2 45°+ cos²60
cos²60 = Sin? 30° + Sin245
Sin² 60
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Step-by-step explanation:
-1/2
-1/2sin245−sin260=xcos245
-1/2sin245−sin260=xcos245⇒(21)2−(23)2=x(21)2
-1/2sin245−sin260=xcos245⇒(21)2−(23)2=x(21)2⇒(22)2−(23)2=x(22)2
-1/2sin245−sin260=xcos245⇒(21)2−(23)2=x(21)2⇒(22)2−(23)2=x(22)2⇒42−43=42x
-1/2sin245−sin260=xcos245⇒(21)2−(23)2=x(21)2⇒(22)2−(23)2=x(22)2⇒42−43=42x⇒−41=21x
-1/2sin245−sin260=xcos245⇒(21)2−(23)2=x(21)2⇒(22)2−(23)2=x(22)2⇒42−43=42x⇒−41=21x⇒x=−
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