" 16."(2tan^(2)30^(@)sec^(2)52^(@)sin^(2)38^(@))/(cosec^(2)70^(@)-tan^(2)20^(@))=?

Without using trigonometric table,evaluate the following: (cos ec^(2)(90-theta)-tan^(2)theta)/(4(cos^(2)48^(@)+cos^(2)42^(@)))-(2tan^(2)30^(@)sec^(2)52^(@)sin^(2)38^(@))/(cos ec^(2)70^(@)-tan^(2)20^(@))

Choose the correct answer in each of the following questions: (2tan^(2)30^(@)sec^(2)52sin^(2)38^(@))/("cosec"^(2)70^(@)-tan^(2)20^(@))=?

Evaluate : ((sec^(2)27^@-cot^(2) 63^@) +(sin^(2) 52^(@)+sin^(2) 38^@))/((cosec^(2) 34^(@)-tan^(2) 56^(@)) +tan 10^@.tan 20^@ .tan 30^@.tan 70^@. Tan 80^@)

Without using trigonometric table, evaluate the following: (cosec^2(90-theta)-tan^2theta)/(4(cos^2 48^@+cos^2 42^@))-(2tan^2 30^@ sec^2 52^@ sin^2 38^@)/(cosec^2 70^@-tan^2 20^@

What is the value of (tan^(2)25^(@))/(cosec^(2)65^(@))+(cot^(2)25^(@))/(sec^(2)65^(@))+tan20^(@)45^(@)tan70^(@) ?

sec^(2)(70^(@))-tan^(2)(70^(@)) is equal to

The value of (sin25^(@)cos65^(@)+cos25^(@)sin65^(@))/(tan^(2)70^(@)-cosec^(2)20^(@))

sec70^(@)sin20^(@)+cos20^(@)cosec70^(@)=2

sec^(2)(tan^(-1)(2))+cosec^(2)(cot^(-1)(2))=

Calculate : sec^(2)60^(@)-cot^(2)30^(@)-(2tan30^(@)"cosec"60^(@))/(1+tan^(2)30^(@)) .