find the value sec−1[sec(−30)]=?

Find the value of : cosec[sec^(-1)(sqrt(2))+cot^(-1)(1)]

If tan theta =(1)/(sqrt(7)) , find the value of ("cosec"^(2)theta-sec^(2)theta)/("cosec"^(2)theta+sec^(2)theta) .

If tan ^(-1).(3)/(4)=x , the find the value of sec x.

If A = 15^(@) , then find the value of sec 2A.

Find the value of : sec(cos^(-1)(2/3))

Find the value of sec^(-1)(-2)+tan^(-1)(-1/sqrt3)

Find the value of cos(sec^(-1)x+"c o s e c"^(-1)x) , |x|geq1

Find the value of cos(sec^(-1)x+cose c^(-1)x),|x|geq1

Find the value of sqrt(3)cosec20^(@)-sec20^(@)

If sectheta=(2)/(sqrt(3)) ,then find the value of sec2theta .