Does grade 11 / grade 12 students have cosine rule and sin rule shitz in India ? And that 0.5ab sin C rule ?

Because I was wondering how they do it without calculator

We do, and we are asked with standard angles, so you know the values for the standards (0, pi/6, pi/4, pi/3, pi/2)

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But how do you get inverses

Coz they might give you the area of the triangle and two sides and ask you to find sin C

In which case you need sin-1 C

link

I didn't use it
Heard that it is pretty stable

link

Unlocked bootloader?

Pubg lags too much

Jasper update when?

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Any gd rom for pubg?

Never

Purchased poco

I don't think you have that question per se. You get questions where you are required to calculate the another side. And if you have the standard angles, it is easy to calculate.
Ex: sin(pi/2) = 1; sin^-1 (1) = pi/2