Question

1. Demonstrati ca in triunghiul ABC, dreptunghic in A, are loc egalitatea sin B +cos B=$\frac{AB+AC}{BC}$
2. Demonstrati ca in triunghiul ABC,dreptunghic in A tg B=$\frac{sinB}{cosB}$=$\frac{1}{ctgB} }$si tg C=$\frac{sinC}{cos C} } }$=$\frac{1}{ctgC} } } }$

Answer 1

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