Resolver sin a = 4/7; cos phi - sec(phi); overline =? | 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

$$sina=\frac{4}{7}; cos\phi-sec\phi; \overline{=?}$$