In support of efforts to foreground functions as central objects of study in algebra, this study provides evidence of how secondary students use trigonometric functions in contextual tasks. The author ...

Examples of modes of transport used on land: Bus, car, train, truck Examples of modes of transport used on water: Ship, boat Examples of modes of transport used in air: Aeroplane, helicopter (iii) ...

Any motion which repeats itself at regular intervals of time is known as periodic motion. If a body moves back and forth repeatedly about its mean position then it is said to be in oscillatory motion.