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Prove that sin51^(@)+cos81^(@)=cos21^(@...

Prove that `sin51^(@)+cos81^(@)=cos21^(@)` .

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JBD PUBLICATION-TRIGNOMETRIC FUNCTIONS-EXAMPLE
  1. Prove the following: (sin5x + sin 3x)/(cos5x + cos3x)=tan4x

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  2. Prove the following:sin(150^@+x)+sin(150^@-x)=cosx

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  3. Prove that sin51^(@)+cos81^(@)=cos21^(@) .

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  4. Show that: sn10^@+sin20^@+sin40^@+sin50^@=sin70^@+sin80^@

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  5. Find the principal solutions (0 le x le 2pi) of the following euqtions...

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  6. Find the principal solutions (0 le x le 2pi) of the following euqtions...

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  7. Find the principal and general solutions of the following equation:- t...

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  9. Find the general solution of the following equations: cos 4 x = cos 2x

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  10. Find the general solutions of the equations sinx+sin3x+sin5x=0.

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  11. Find the general solution of the following equations: cos 4 x = cos 2x

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  12. An athlete runs 4 times around a circular running a path to describe 1...

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  13. Prove that: cot^2frac (pi)(6)+cosecfrac (5pi)(6)+3tan^2frac (pi)(6)=6

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  14. In triangleABC, prove that cos(A+B)+cosC=0

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  15. In triangleABC, prove that cos((A+B)/(2))=sinC/2

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  16. Prove the following: cos((3pi)/2+x)cos(2pi+x)[cot((3pi)/2-x)+cot(2pi+x...

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