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