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MODERN PUBLICATION-TRIGONOMETRY-Miscellaneous Exercise on chapter (3)
- 2cos(pi/13)cos(9pi/13)+cos(3pi/13)+cos(5pi/13)=0
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- Prove that: ("sin"3x+"sin"x)"sin"x+(cos3x-cosx)cosx=0
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- Prove that: (cosx+cosy)^2+(sinx-siny)^2=4cos^2(x+y)/2
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- Prove that sin x + sin 3x + sin 5x + sin 7x=4 sin 4x cos 2x cos x.
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- (( sin 7x + sin 5x)+(sin 9x + sin 3x))/((cos 7x + cos 5x)+(cos 9x+ cos...
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- Prove that: s in" "3x" "+" "s in" "2x" "" "s in" "x" "=" " 4" "s in" "...
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- Find sinx/2,cosx/2and tanx/2of the following : tanx=-4/3,xin quadrant ...
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- Find sin(x/2), cos(x/2) and tan(x/2) in each of the following if cosx=...
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- Find sin x/2 ,cos x/2 and t a n x/2 of the following : s in" "x" "=1/...
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