Calculate the - 5th power of 1.3 times 10

Calculate the - 5th power of 1.3 times 10


Original formula = 0.000013



F (- 31 π / 3) =? F (a) = - cosa. Why should f (- 31 π / 3) = - cos (31 π / 3)? Be equal to cos (- 31 π / 3)?
Can negative sign be put forward?


f(a)=-cosa
f(x)=-cosx
Because cos (- x) = cosx
So f (- 31 π / 3) = - cos (- 31 π / 3) = - cos (31 π / 3) is not a negative sign



Is cos (180-2a) equal to cosa


Unequal
cos(180°-2A)=-cos2A