Question

please give a step by step explaination​

Answer 1

Answer:

x cos A=1

x=1/cos A

y cot A=1

y=1/cot A

now

LHS,=x^2-y^2

=(1/cos A)^2-(1/cot A)^2

=

Answer 2

Step-by-step explanation:

x Cos A = 1   ∴ Cos A = 1/x = base / hypotenuse

y Cot A = 1    ∴ Cot A = 1/y = base / perpendicular

Using Pythagoras Theorem, for a right angle triangle

hypotenuse² = base² + perpendicular²

⇒ x² =  1² + y²

⇒ x² - y² = 1 .... hence proved