Introduction to...

Triangle measurement is called as _______.

Who is the founder of trigonometry?

______ mathematicians created the trigonometry system based on the sine function instead of the chords.

In the early 9th century AD, _________ produced accurate sine and cosine tables, and the first table of tangents.

Which of the following is equal to $$\sin x \sec x$$?

The value of $$\tan\theta \times \cot\theta =$$ _____

The value of $$\sin\theta\times  \text{cosec}\,\theta =$$ _____

Who published the trigonometry in 1595?

In the given figure, $$BC=15cm$$ and $$\sin{B}=\dfrac{4}{5}$$, What is the value of $$AB$$?

Choose the correct option. Justify your choice.
$$\displaystyle 9{ \sec }^{ 2 }A-9{ \tan }^{ 2 }A=$$