Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesMix Examples-Trigonometrical Ratios, Functions and Identities
Difficult$\operatorname{cosec} 18^{\circ}$ is a root of the equation :
- A$x^{2}+2 x-4=0$
- B$4 x^{2}+2 x-1=0$
- C$x^{2}-2 x+4=0$
- D$x^{2}-2 x-4=0$
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