Question

Express $\cos {79}^o+\sec {79}^o$ in terms of angles between $0^o$ and ${45}^o$

• A. $1$
• B. $2$
• C. $\sin {11}^o+\text{cosec}{11}^o$
• D. $\cos {11}^o+\sec {11}^o$

Answer 1

Answer: (C)

$\sin {11}^o+\text{cosec}{11}^o$

Given,

$\cos {79}^o+\sec {79}^o$

$=\cos ({90}^o-{11}^o)+\sec ({90}^o-{11}^o)$

$=\sin {11}^o+\text{cosec}{11}^o$