"One and itself, example would be the least common multiple 2, it would be one and two being they're both multiples of two."
Top right would be rhombus
The missing length is 12km (i never promised anything xd)
All real numbers is the correct answer.
Tan(x)= sin(x)/cos(x), therefore, substitute sin(x)/cos(x) in the expression:
=(cos(x)(sin(x)/cos(x))-1)/cos^2(x)
simplify the 2 cos(x):
=(sin(x)-1)/cos^2(x)
Sin^2(x)+ cos^2(x)=1, sin^2(x)-1=- cos^2(x), substitute in the expression:
= -cos^2(x)/cos^2(x)= -1