(1) Sino
cose + cose = seco
(2) cos²O(1 + tan²0) = 1
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Answer:
l
Step-by-step explanation:
2. cos²x(1+tan²x)
cos²x(sec²x)
sec²x=1+tan²x
cos²x.1/cos²x
=1
secx=1/cosx
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