Đáp án + Giải thích các bước giải:
`A=(sin32^0)/(cos58^0)=(sin32^0)/sin(90^0-58^0)`
`=(sin32^0)/(sin32^0)=1`
`B=tan76^0-cot14^0`
`=cot(90^0-76^0)-cot14^0`
`=cot14^0-cot14^0=0`
Áp dụng các công thức :
`sinalpha=cos(90^0-alpha)`
`cos alpha=sin(90^0-alpha)`
`tan alpha=cot(90^0-alpha)`
`cotalpha=tan(90^0-alpha)`.
Đáp án:
Giải thích các bước giải:
1.$A=\frac{sin32^0}{cos58^0}$
$A=\frac{sin32^0}{cos(90^0-58^0)}$
$A=\frac{sin32^0}{sin32^0}$
$A=1$
2.$B=tan76^0-cot14^0$
$B=tan76^0-tan(90^0-14^0)$
$B=tan76^0-tan76^0$
$B=0$
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