15. Vi cot e
cot 20 = cosec 20. (h)
1
1
16.
tan 3 I ran &
cot r I cot
Answers
Answered by
10
Step-by-step explanation:
Let I=
3
cosec 20−sec20
=
sin20
3
−
cos20
1
=
sin20cos20
3
cos20−sin20
=4[
2sin20cos20
2
3
cos20−
2
sin20
]
=4[
sin(40)+sin(0)
cos30cos20−sin30sin20
]
=4
sin50
cos40
=4
sin50
cos(90−40)
=
sin50
4sin50
I=4
Hope it helps you
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