Science dealing with the outbreak and spread of disease

if cot x- tan x=7 then what is the value of cot x + tan x=?

Find the exact value of cos120°

If A, B and C are angles of triangle, then sin2A + sin2B + sin2C– 2cosA cosB cosC

If {(tanx)/(secx)} × cosx = (1/2), then determine the value of ‘sin2x’.

If sec 4A = cosec (3A - 50°), where 4A and 3A are acute angles, find the value of A + 75.

If sin A = 3/5 and cos B = 4/5, where A and B are acute angles, find the value of sin(A + B).

∆ PQR is right-angled at Q. If ∠R = 60º, then find the value of cosec P.

Find the value of sin²65^o + sin²25^o + cos²35^o + cos²55^o.