`sec^(2)(20)-tan^(2)(20)` is

The value of (tan^(2)20^(@)-sin^(2)20^(@))/(tan^(2)20^(@).sin^(2)20^(@)) is

If x,y,z are variables and 3tan x+4tany+5tanz=20, then the minimum value of tan^(2)x+tan^(2)y+tan^(2)z, is

Prove that sec^(4)A-sec^(2)A=tan^(2)A+tan^(4)A .

vec(r)=15t^(2)i+(20-20t^(2))j find magnitude of acceleration at t=1 sec.

The expression cosec^(2)A cot^(2)A-sec^(2)A tan^(2)A-(cot^(2)A-tan^(2)A)(sec^(2)A cosec^(2)A-1) is equal to

tan^(6)20^(@) - 33tan^(4) 20^(@) + 27 tan^(2) 20^(@) + 4=

If a chord joining P(a sec theta, a tan theta), Q(a sec alpha, a tan alpha) on the hyperbola x^(2)-y^(2) =a^(2) is the normal at P, then tan alpha is (a) tan theta (4 sec^(2) theta+1) (b) tan theta (4 sec^(2) theta -1) (c) tan theta (2 sec^(2) theta -1) (d) tan theta (1-2 sec^(2) theta)

Prove that: i) cot^(2)A+cot^(4)A="cosec"^(4)A-"cosec"^(2)A ii) tan^(2)A+tan^(4)A=sec^(4)A-sec^(2)A

The value of tan20^(@)+2 tan50^(@)-tan70^(@), is

If m = a sec A + b tan A and n = a tan A + b sec A, then prove that : m^(2) - n^(2) = a^(2) - b^(2)