The range of the fonction f(x) = cosec^2(x).+ sec^x is
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Answer:
ANSWER
LHS :
3
cosec20
o
−sec
2
20
o
=
sin20
o
3
−
cos20
o
1
=
sin20
o
cos20
o
3
cos20
o
−sin20
o
=
sin20
o
cos20
o
2[
2
3
cos20
o
−
2
1
sin20
o
]
=
sin20
o
cos20
o
2(sin60
o
cos20
o
−cos60
o
sin20
o
)
=
sin20
o
cos20
o
2sin(60
o
−20
o
)
=
sin20
o
cos20
o
2sin40
o
=
2sin20
o
cos20
o
4sin40
o
=
sin40
o
4sin40
o
=4 = RHS
Step-by-step explanation:
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