Prove the identity.sin 2x = -2 sin(x - ?/2) cos (x - ?/2)
What will be an ideal response?
-2 sin(x - ?/2) cos (x - ?/2)
= -2 ? (-sin(?/2 - x) ) ? cos (?/2 - x) Using odd and even identities
= 2 cos x sin x Using cofunction identities
= sin 2x Using double-angle identity
Mathematics
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Find 
and 
.f(x, y) = 
A. 
= - 
; 
= - 
B. 
= - 
; 
= - 
C. 
= - 
; 
= - 
D. 
= 
; 
= 
Mathematics
Graph the polar equation.r = 2?
A. 
B. 
C. 
D. 
Mathematics
Multiply and simplify.
? 
A. 5m
B. 
C. 
D. 10
Mathematics
The sides in each pair of figures are proportional. Find the missing length.
A. 6 ft B. 23 ft C. 12 ft D. 36 ft
Mathematics