what is the value of sin²30+cot²30-2cos²60/4sec²45-4sin²30
Answers
Answered by
0
Answer:
cot
2
30
∘
−2cos
2
60
∘
−
4
3
sec
2
45
∘
−4sec
2
30
∘
=(
3
)
2
−2(
2
1
)
2
−(
4
3
)(
2
)
2
−4(
3
2
)
2
=3−
4
2
−
4
6
−
3
16
=
4
12
−
4
2
−
4
6
−
3
16
=(
4
12−2−6
)−
3
16
=
4
4
−
3
16
=1−
3
16
=
3
3
−
3
16
=
3
−13
Step-by-step explanation:
hope it helps u ..
Answered by
0
Step-by-step explanation:
cscA(1+cosA)(cscA−cotA)=1
LHS:
sinA
1
[1+cosA][
sinA
1
−
sinA
cosA
][∵cscA=
sinA
1
,cotA=
sin
A
cos
A
]
=
sinA
A
(1+cosA)
sinA
(1−cosA)
=
sin
2
A
1−cos
2
A
[∵ cos
2
A+sin
2
A=1 sin
2
A=1−cos
2
A]
=
sin
2
A
sin
2
A
=1=RHS
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