Which of the following statements is trueI- ln a - ABC if a-cos A-b-cos B-c-cos C then the triangle is equilateralII- ln a - ABC- -a2sin Bsin C-2sinB-C

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Value of Standard Angle(30,60,90)

Which of the ...

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Which of the following statements is true

I: ln a $Δ A B C$ if $\frac{a}{cos A} = \frac{b}{cos B} = \frac{c}{cos C}$ then the triangle is equilateral
II: ln a $Δ A B C, Δ = \frac{a^{2} sin B sin C}{2 sin (B + C)}$

only I

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only II

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both I and II

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neither I nor II

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