Who from among the following was the founder

Find the value of the given expression.

2 × (sec 60° – sin 30°)

If tan α = 1/2, tan β = 1/3, then find α + β.

if 8 sin ² x + 3 cos ² x = 4  then find tan x

If tan 4θ = cot 14θ, then find the value of cos 9θ.

If tan θ + cot θ = 2 where 0 < θ < 90 ; find the value of tan³⁰ θ + cot ²⁹ θ.

If sec(2A + B) = 2 and cos(A + B) = (1/√2) , find the value of {sec 2B + tan (A + B) } given that 0^o < A, B < 90^o

If 30sin⁴theta; + 45 cos⁴theta; = 18 . Then find the value of 216 cosec⁶theta; + 64 sec⁶