Education

It's dog's life after all

A butcher watching over his shop is really surprised when he saw a dog coming inside the shop. He shoos him away. But later, the dog is back again. So, he goes over to the dog and notices he has a note in his mouth.   He takes the note and it... Read More

Pythagorean Identities

sin²θ+ cos²θ = 1 1 + tan²θ = sec²θ 1 + cot²θ = csc ²θ From (a) sin²θ = 1 − cos²θ i.e. cos²θ = 1 − sin²θ These are called Pythagorean identities, because, as we will see in their proof, they are the trigonometric version of... Read More

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