Question

Evaluate :cosec 13 /sec 77 - cot20/tan70

Answer 1

Hope it's clear to you!!!

Answer 2

Answer:

$Value \:of \: \frac{cosec13}{sec77}-\frac{cot20}{tan70}=0$

Step-by-step explanation:

$Value \:of \: \frac{cosec13}{sec77}-\frac{cot20}{tan70}\\=\frac{cosec(90-77)}{sec77}-\frac{cot(90-70)}{tan70}$

/*we know that,

1)cosec(90-A)=secA

2)cot(90-A)=tanA */

$=\frac{sec77}{sec77}-\frac{tan70}{tan70}\\=1-1\\=0$

Therefore,

$Value \:of \: \frac{cosec13}{sec77}-\frac{cot20}{tan70}=0$

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