sina + cosa = ((sina + cosa )^2)^1/2 = ( sin^2a + 2sina * cosa + cos^2a)^1/2 = ( 1 + 2*)^1/2 =
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sina + cosa = ((sina + cosa )^2)^1/2 = ( sin^2a + 2sina * cosa + cos^2a)^1/2 = ( 1 + 2*
)^1/2 = ![\sqrt{\frac{5}{3 } \sqrt{\frac{5}{3 }](https://tex.z-dn.net/?f=%5Csqrt%7B%5Cfrac%7B5%7D%7B3%20%7D)