If P+Q+R =180°, prove that cos(Q+R-P) + COS(R+P-Q) + COS (P+Q-R) = SIN^2 P + 4 COSP COSQ COSR + COS^2 P​

answer: 4 meters

step-by-step explanation: to you understand 2/3 better you can do 1 divided by 3 = . then multiply that by the 2 which is .66666666666666667 then you would do 6 x .66666666666666667 which is 4.      

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step-by-step explanation:

6e14 is the answer.