(cos 0+sin 45+sin 30)(sin 90-cos 45+cos 60)

= 

= 

= 

/* By algebraic identity

(a-b)(a+b) = a²-b² */

= 

= 

= 

An operating system is a group of system software that is responsible for controlling a computer’s hardware and software, providing a user interface with which to interact and manage the computer’s resources. Due to this, the operating system has a large number of different functions and jobs. To make these functions easier to understand, they will be grouped into different categories based on their goals.

These categories consist of the following:

• Starting the computer
• Providing a user interface
• Managing programs

(a + b)³ = a³ + 3a²b + 3ab² + b³ ; (a + b)³ = a³ + b³ + 3ab(a + b)

The various steps involved in the process of nutrition are:

Ingestion: Amoeba ingests food with the help of its finger-like extensions, called pseudopodia. When a food particle approaches Amoeba, it forms pseudopodia around it and forms a food vacuole inside the Amoeba.
Digestion: Various enzymes from the cytoplasm enter into the food vacuole and break them down into simple soluble molecules.
Absorption: The simple soluble food is absorbed by cytoplasm of Amoeba from food vacuoles through the process of diffusion.
Assimilation: Amoeba cell obtains energy from the absorbed food through respiration. This energy is utilised by Amoeba for its growth and repair of the body.
Egestion: When a considerable amount of undigested food gets collected inside Amoeba, its cell membrane ruptures and throws out the undigested food.

• Democracy believes in a government of the people for the people. Non-democracy is completely against this idea.

• In a democratic state, the people can choose their leader. They are also entitled to have their say in the legislation of the state. In a non-democratic state, the people cannot choose their leaders and neither do they have a say in the legislation of the land.

• Democracy is a specific kind of government. Many government systems fall under the umbrella of non-democracy.