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8) sin A cos B = ˝ [ sin ( A + B ) + sin ( A - B ) ]

cos A sin B = ˝ [sin ( A + B ) - sin ( A - B ) ]

cos A cos B = ˝ [cos ( A + B ) + cos ( A - B ) ]

sin A sin B = ˝ [cos ( A - B ) - cos ( A + B) ]

9) sin P + sin Q = 2 sin cos

sin P - sin Q = 2 cos sin

cos P + cos Q = 2 cos cos

cos P - cos Q = -2 sin sin

= 2 sin sin
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10) sin 2A = 2 sin A cos A =

cos 2A = cos2A - sin2A = 2 cos2 A - 1

= 1 - 2 sin2A =

tan 2A = ; cot 2 A =

1 + cos q = 2 cos 2 q/2 ; 1 - cos q = 2 sin 2 q/2

Index

Introduction

1.1 Functions And Mapping
1.2 Functions, Their Graphs and Classification
1.3 Rules for Drawing the Graph of a Curve
1.4 Classification of Functions
1.5 Standard Forms for the equation of a straight line
1.6 Circular Function and Trigonometry

Chapter 2