please help friends
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([email protected]@.cos@)/cosec@ + ([email protected]@.sin@)/cosec@,
(sin²@[email protected]@) + (cos²@[email protected]@),
[email protected]@(sin²@+cos²@),
[email protected]@(1),
[email protected]@
(sin²@[email protected]@) + (cos²@[email protected]@),
[email protected]@(sin²@+cos²@),
[email protected]@(1),
[email protected]@
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