0 Sin-¹ (-√₂/2) = tan 3/2 = з пра sin 660= tan-1 (-√3)=
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A: we are supposed to answer the first question and rest can be reposted.
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A: As per the rules we can answer the first question in the list and rest can be reposted.
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A: concept used cos(A-B)=cos(A)cos(B)+sin(A)sin(B)
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Q: 20/√3
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