Question
Asked Nov 7, 2019
plicationS
e Sum an
s of th
Verify that each eq
Example XXI :
1. sec(T-)
sec x
11
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plicationS e Sum an s of th Verify that each eq Example XXI : 1. sec(T-) sec x 11

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Step 1
The given identity is sec(n-x) =-secx
Choose sec(7
п —х) to prove -sec x.
1
sec (т - х)-
Y
cos(-x)
1
cos(7)cos(x)
sin (77)sin (x
(cos(a-b)cos(a)cos(b)+ sin (a)sin (b))
1
( cos(),sin ()= °)
(-1) cos (x)+(0) sin (x)
1
-cos(x)+0
help_outline

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The given identity is sec(n-x) =-secx Choose sec(7 п —х) to prove -sec x. 1 sec (т - х)- Y cos(-x) 1 cos(7)cos(x) sin (77)sin (x (cos(a-b)cos(a)cos(b)+ sin (a)sin (b)) 1 ( cos(),sin ()= °) (-1) cos (x)+(0) sin (x) 1 -cos(x)+0

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