Find the value of ( cosec2
A-1)tan 2 A
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They are called this because they involve trigonometric functions of double angles, i.e. sin 2A, cos 2A and tan 2A. ... Similarly tan(A + A) = tanA + tanA 1 − tanAtanA so that tan 2A = 2 tanA 1 − tan2 A These three double angle formulae should be learnt.
How to proof the formula of tan 2A is equals 2tanA1−tan2A? Note: (i) In the above formula we should note that the angle on the R.H.S. is half of the angle on L.H.S. Therefore, tan 60° = 2tan30°1−tan230°. (ii) The above formula is also known as double angle formulae for tan 2A.
Hope it is usefull.
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