TS EAMCET 9-Sep-2020 Shift 2 Solved Paper

Section: Mathematics

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Question : 28 of 160

Marks: +1, -0

In any triangle ABC

cos2‌

A

2

+cos2‌

B

2

+cos2‌

C

2

=

1+
2r
R
2−
1
2R
2(1+
r
4R
)
2(1+
r
2R
)

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