1. cos135 = cos(180-45) = cos45 = <span>√</span>2/2
2. sin 8pi/3 = sin(2pi+2pi/3) = sin 2pi/3 = <span><span>√</span>3</span>/2
3. tg 7pi/3 = tg(2pi+pi/3) = tg pi/3 = <span><span>√</span>3</span>
<span>sin15+cos65 = 0,2588 + 1/2 = 0,2588 + 0,5 = 0,7588</span>