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`        if tan (x+y)/tan (x-y)=2p+q/2p-q, find 1-cos4x/1-cos4y.? `
one year ago

shubham vishwakarma
15 Points
```							tan(x+y)/tan(x-y)=2p+q/2p-qso,if a/b=c/dthen , a+b/ a-b = c+d / c- dthereforetan(x+y) + tan (x-y) / tan(x+y) - tan(x-y) = 2p + q + 2p -q / 2p + q - (2p - q)Simplifying by breaking "tan" function into sin and cos we get,sin(x+y) cos(x-y)+sin(x-y) cos (x+y) /sin(x+y)cos(x-y)-sin(x-y)cos (x+y) = 2p/q Now by applyingsinAcosB+sinBcosA=sin(A+B)sinAcosB-sinBcosA=sin(A-B)sin(2x)/sin(2y) = 2p/qsquaring both sides[Sin(2x)]^2 / [sin(2y)]^2 = 4p^2/q^2By applying1-cos4A=sin(2A)^21-cos(4x)/1-cos(4y) = 4 p^2 / q^2
```
one year ago
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• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
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