Answers

2015-09-09T16:04:39+05:30
-1+ sinA cosA/ tanA= -1+ sinAcosA÷sinA / cosA = -1 sinA cosA ×cosA /sinA = -1+ cos2A = -sin2A identity used in this question are sin(90°- a)=cosA cot(90°-a)=tanA and tanA= sinA/cosA
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