- Home
- Standard 11
- Mathematics
3.Trigonometrical Ratios, Functions and Identities
easy
મૂલ્ય શોધો. $\cos ec \left(-1410^{\circ}\right)$
A
$2$
B
$2$
C
$2$
D
$2$
Solution
It is known that the values of $cos ec$ $x$ repeat after an interval of $2 n$ or $360^{\circ} .$
$\therefore \cos ec \left(-1410^{\circ}\right)=\cos ec \left(-1410^{\circ}+4 \times 360^{\circ}\right)$
$=\cos ec \left(-1410^{\circ}+1440^{\circ}\right)$
$=\cos ec \,30^{\circ}=2$
Standard 11
Mathematics
