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Prove that:cos(x+135^@)-cos(x-135^@)=-sq...

Prove that:`cos(x+135^@)-cos(x-135^@)=-sqrt2 sinx`

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JBD PUBLICATION-TRIGNOMETRIC FUNCTIONS-EXAMPLE
  1. Prove that:cos(x+135^@)-cos(x-135^@)=-sqrt2 sinx

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  2. Find the solutions of the equation sinx=-sqrt3/2 when x in [0,pi]

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  3. Prove that:(cos7x+cos5x)/(sin7x-sin5x)=cotx

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  4. Prove that: sin3x=3sinx-4sin^3x

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  5. Prove the following: (sinx + sin3x)/(cosx + cos3x)=tan 2x

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  6. Find the radian measures corresponding to the following degree measure...

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  7. Find the radian measures corresponding to the followind degree measure...

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  8. A wheel makes 360 revolutions in one minute. Through how many radians ...

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  9. A circular wire of radius 7.5 cm is cut and bent so as to lie along th...

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  10. Find the values of other five trignometrtic functions in each of the f...

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  11. Find the values of other five trignometrtic functions in each of the f...

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  12. Find the values of the trignometric functions in the following: cosec(...

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  13. Find the values of the trignometric functions in the following: tan (1...

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  14. Find the values of: sin((-11pi)/3)

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  15. Show that no value of theta can satisfy the equations: 6 sec^2theta-5s...

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  16. Find the value of: cos((5pi)/12)

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  17. Find the value of: tan((13pi)/12)

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  18. Prove the following: cos(pi/4-x)cos(pi/4-y)-sin(pi/4-x)sin(pi/4-y)= si...

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  19. Prove the following: sin^2 6x-sin^2 4x = sin 2x sin 10x

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  20. Prove the following: cos^2 2x - cos^2 6x = sin 4x sin 8x

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