Question

find the value of cos (-1710°)​

Answer 1

Answer:

Step-by-step explanation:

$\cos (-1750)^\circ\\\\=\cos 1750^\circ\\\\=cos (4\times 360+270)^\circ\\\\=\cos 270^\circ\\\\= -\cos ( 180+90)^\circ\\\\=-\cos 90^\circ\\\\=0$

Answer 2

Step-by-step explanation:

cos(-x)=cosx

cos(-1710)=cos1710

where 1710=19π/2

cosnπ/2=0,where n is odd

cosnπ/2=1,where n is even

cos(-1710)=0