Posted by Lucy on .
Which of the following expressions are not equal to 1?
A) sin^2 theta + cot^2 theta sin^2 theta
B) (sin^2 theta/1cos theta)cos theta
C) sec^2 theta + tan^2 theta
D) cot^2 theta sin^2 theta/cos^2theta
Answer: D

Algebra II 
Damon,
for D I get
c^2/s^2 * s^2 /c^2 = 1 sorry
A gives
s^2 (1 + c^2/s^2) = s^2 + c^2 = 1
B gives (does not make sense the way you wrote it)
Maybe you mean
sin^2 theta/(1cos theta)cos theta
[s^2 c (1c)] /(1c)
[ s^2 + c^2 c] / (1c)
(1c) / (1c)
1
C gives
(1/c^2) + s^2/c^2
= (1 + s^2)/c^2
not 1