If a+b+c=180 prove that cos^2a + cos^2b + cos^2c = 1 - 2cosacosbcosc

hope it

step-by-step explanation:

x^(1/6) · x^(1/6) · x^(1/6)   ·x^(1/6) = x^(4/6)   since we add the exponents

4/6 can be simplified to 2/3

the simplified form is x^(2/3)

so, converting firstly the mixed fractions to improper fractions and then "adding".