how to evaluate trig functions with symmetry properties ♡

$sin (\frac{4 π}{3})$

$cos (\frac{7 π}{6})$

$tan (\frac{- 3 π}{4})$

$sin (\frac{- 2 π}{3})$

$cos (\frac{7 π}{4})$

$tan (\frac{- 5 π}{6})$

$cos (\frac{5 π}{6})$

$sin (\frac{11 π}{6})$

$tan (\frac{3 π}{4})$

$sin (\frac{- 5 π}{4})$

$tan (\frac{- 7 π}{6})$

$cos (\frac{5 π}{3})$

$sin (\frac{- 7 π}{4})$

$cos (\frac{- 4 π}{3})$

$tan (\frac{5 π}{4})$

$sin (\frac{- π}{3})$

$cos (\frac{9 π}{4})$

$tan (\frac{- 7 π}{3})$

$sin (\frac{3 π}{4})$

$cos (\frac{- 4 π}{3})$

wiki ♡