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i) If sinalpha=3/5 where pi/2ltalphaltpi, evaluate cos3alpha and tan 2alpha(TS March-2015) ii) If cosA=7/25 and (3pi)/2ltA lt2pi , then find the value of "cot"A/2 (iii) If 0ltAltpi/4 and cosA=4/5 find the values of sin2A and cos2A

Answer»


ANSWER :i) `44/125, (-24)/7`
ii) `(-4)/3`
III) `24/25, 7/25`


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