solve 4 question please
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(sin⁴@-cos⁴@+1).cosec²@,
[(sin²@)²-(cos²@)²+1].cosec²@,
[(sin²@+cos²@)(sin²@-cos²@)+1].cosec²@,
[1×(sin²@-cos²@)+1].cosec²@,
[sin²@-cos²@+sin²@+cos²@].cosec²@,
[2sin²@].cosec²@,
2sin²@.cosec²@,
2sin²@×1/sin²@,
2
[(sin²@)²-(cos²@)²+1].cosec²@,
[(sin²@+cos²@)(sin²@-cos²@)+1].cosec²@,
[1×(sin²@-cos²@)+1].cosec²@,
[sin²@-cos²@+sin²@+cos²@].cosec²@,
[2sin²@].cosec²@,
2sin²@.cosec²@,
2sin²@×1/sin²@,
2
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