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b) tg(-150°) = - tg150° = - tg (180°-30°) = - (- tg30°) = tg30° = √3 /3
c) cos(-315°) = cos315° = cos(270°+45°) = sin45°= √2 /2
d) sin(-296°) = - sin 296° = - sin(270°+26°) = - (-cos 26°) = cos26° ≈0,8988
e) cos(-95°) = cos95° = cos(90° + 5°)= - sin 5° ≈ - 0,0872
f) tg(-179°) = - tg179° = - tg (180°-1°) = -( -tg 1°) = tg1° ≈ 0,0175