Question

please answer the questions with number very urgent

Answer 1

I am answering question 17

We are given that sinA = cosB and A+B=90

So let us assume A=B=45 and

Sin45 =
$1 \div \sqrt{2}$
As well as cos45 is same.

Hence we proved that if sinA=cosB then A+B =90.

Ans to 16 is

Use the distance formula for two points.