हल करना 90{^{\circ}},81{^{\circ}},a | Equatix - Math Solver

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Example

3(r+2s)=2t-4

a⋅(b-2)=3b

3(r+2s)=2t-4

a⋅(b-2)=3b

Question

$$90 ^ { \circ } ,81 ^ { \circ } ,a$$