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(i) False, Let A = B = Then,    (ii) True, Take  whent   = 0 then zero(0),   = 30 then value of  is 1/2 = 0.5  = 45 then value of  is 0.707   (iii) False,   (iv) False, Let  = 0    (v) True,   (not defined)
Given that, So, ..........(i) therefore, .......(ii) By solving the equation (i) and (ii) we get; and  
We need to prove - Taking LHS; By rationalising the denominator, we get; Hence proved.  
.....................(i) We know the values of- By substituting all these values in equation(i), we get;
We need to prove- Now, taking LHS,                                                                        LHS = RHS Hence proved.
..................(i) It is known that the values of the given trigonometric functions, Put all these values in equation (i), we get;
we know the value of   ,  and , After putting these values 
We know the value of   and   According to question,  
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