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                      0   
               cos45 =  =        =
                        ℎ      2   2
                               
                            
                 tan 45°=  =   = 1
                                

                                              0
               Trigonometric Ratios of 30  and 60      0
               Let us consideranequilateral triangle ABC of side ‘a’ in which AD is a perpendicular.
               We know that AD bisects angle A as well as BC.













































               Variation of trigonometric ratios from 0 to 90 degrees
               Consider a ΔABC which is right-angled at B, such that ∠A is very small:











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