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Mathematics, 09.08.2022 16:50 bubbaforbes2005

Hey guys please help? Trigonometry So, the task is: find cos a, if:

1) sin a = (3√11)/10, a ∈ (0; π/2)

2) sin a = (3√11)/10, a ∈ (π/2; π)

Could someone please explain how to solve it? I can't figure out what difference a ∈ (0; π/2) and a ∈ (π/2; π) make in the way I have to solve it mmh... I'll pin my attempt to do the first one (failed for some reason)

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Hey guys please help? Trigonometry So, the task is: find cos a, if:

1) sin a = (3√11)/1...
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