11th Std Maths Example 3.41 If A+B+C=π prove that cos²A+cos²B+cos²C=1-2cosAcosBcosC

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11th maths example 3.41 //chapter 3 // class 11 11th maths example 3.41 //chapter 3 // class 11
11th Std Maths Example 3.39(i) If A+B+C =π, prove that cosA+ cosB+ cosC =1+4 sinA/2 sinB/2 sinC/2 11th Std Maths Example 3.39(i) If A+B+C =π, prove that cosA+ cosB+ cosC =1+4 sinA/2 sinB/2 sinC/2
11th Maths Example 3.41 11th Maths Example 3.41