Question

plz answer both..........

Answer 1

1):-

cot²@ - 1/sin²@,

cot²@ - cosec²@, (since 1/sin@ = cosec@),


-1 (since cosec²@ - cot²@=1),



2);-.
since
sin@=cos@,

then

sin@/cos@=1,

tan@=1,

tan@=tan45°,

then
@=45°,

therefore

2tan@+cos²@,

2tan45° + cos²45°,

2×1 + (1/√2)²,

2 + 1/2,

5/2