## Unit – III – 3.1 TRIGONOMETRY

Quadrant   Sign of ratios Remember I All are +ve   ( 90 –  θ,   360 +  θ ) All II Sin  and cosec  are +ve, Other ratios are –ve   ( 90 +  θ,   180 –  θ ) Silver   III tan θ and  cot θ  are +ve, Other ratios are –ve ( 180 +  θ,   270 –  θ ) Tea IV cos θ and  sec θ  are +ve, Other ratios are –ve ( 180 +  θ,   360 –  θ ) Cups Ratio Falls in Quadrant Change of ratio Sin…

## Unit – I – ALGEBRA

Matrix and its applications are very important part of Mathematics. Also it is one of the most powerful tools of Mathematics. Matrix notation and operation are used in electronic spread sheet programmes for personal computer, business budgeting, sales projection, cost estimation, analyzing the results of an experiment etc. Also many physical operations such as magnification, rotation and reflection through a plane can be represented mathematically by matrices. Also matrix used in Cryptography. A matrix is a rectangular array of numbers arranged in rows and columns enclosed by brackets. If there…