Cot (A 15)-tan(A-15)= 4cos2a/1 2sin2A

Suhail Shaik

Feb. 6, 2019, 8:29 p.m.

Answers!

Shivanshu Kamboj

Feb. 7, 2019, 10:43 a.m.

Cot(A 15) - tan(A-15)

cos(A 15) / sin(A 15) - sin(A-15) / cos(A - 15)

[cos(A 15)cos(A-15) - sin(A-15)sin(A 15)] / [ sin(A 15)cos(A-15)

cos2A / sin(A 15)cos(A-15)

2cos2A / 2sin(A 15)cos(A-15)

2cos2A / [sin2A sin30]

2cos2A / [ sin2A 1/2]

2cos2A / [(2sin2A 1)/2]

4cos2A / (2sin2A 1)

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