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Of the following, pairs of standard angl...

Of the following, pairs of standard angles are I) `(70^@,20^@)`, ii) `(50^@,40^@)`, iii) `(30^@,45^@)`, iv) `(60^@,90^@)`

A

1 and 2

B

3 and 4

C

1 and 4

D

2 and 3

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