Trigo (took me some 15 mins count ur time)
Geometry
Level
pending
Factorise cosx•cosx + cosy . Cosy + cosz.cosz +2cosxcosycosz -1
πcos(x-y)πcos(x+y)
πsinx
Sinxsinysinz .πcos(x-z)
πcos x
Cos【(x+y+z)/2】* πcos【(x+y-z)/2】
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1 solution
Replace 1 by sinx.sinx + cosx.cosx. the use simple rules and factorise it may appear hard but in 15 steps u can solve it easily make sure u know all things about Trigo b4 starting the problem Try to find multiple solutions!!!