Question

find the value of cos squared theta minus one upon sin squared theta

Answer 1

answer is -1 as given above

Answer 2

Solution:

Remember this trigonometric identity

$Cos^2 A + Sin^2 A=1$

So, $Cos^2 A - 1= -Sin^2 A$

$\frac{Cos^2 \alpha - 1}{Sin^2\alpha }\\\\ \frac{-Sin^2\alpha}{Sin^2\alpha}=-1$