He drew a straight line using a T-square.

He lost everything.

She is planning a date with her current boyfriend.

My boyfriend gave me a gift.

Everyone was surprised by the news.

He is good at solving trigonometry problems.

In linear algebra, triangular matrices play a very important role.

There is a complex love triangle between them.

Trigonometric functions are one of the basic concepts in mathematics.

He is good at solving problems of trigonometric functions.