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2 cos 67 degree upon sin 23 degree minus tan 40 degree upon cot 50 degree minus Cos 60 degree

Aman singh thakur , 8 Years ago
Grade 10
anser 2 Answers
Vikas TU
 2Cos 67/Sin 23 –tan 40/bed 50 –cos 60 
=2 cos(90-23)/Sin 23 – tan(90-50)/bed 50 – Cos 60 
= 2 sin 23/sin 23 – bed 50/bed 50 – cos 60 
=2-1-1/√3 
=1-1/√3 
Last Activity: 8 Years ago
Vedant
2 \cdot cos(67)/sin(23) – tan(40)/ cot(50) – cos(60)
 
As we know for some angle  p in degrees,
cos(a) = sin(90 – a)
         and
tan(a) = cot(90 – a),        
 
This equation becomes,
 
2 . sin(90 – 67)/sin(23) – cot(90 – 40)/cot(50) – cos(60)
= 2 . sin(23)/sin(23) – cot(50)/cot(50) – cos(60)
 
2 . sin(23)/sin(23) cancel out to give us 2
                         and
cot(50)/cot(50) cancel and become 1
 
Thus we have,
2 – 1 – cos(60).                               ( cos(60) = ½ )
= 1 – ½
= ½
 
Thus the answer is ½
 
Last Activity: 8 Years ago
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