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Prove the following: cos(pi/4-x)cos(pi/4...

Prove the following: `cos(pi/4-x)cos(pi/4-y)-sin(pi/4-x)sin(pi/4-y)= sin (x+ y)`

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Prove the following: cos((3pi)/4+x)-cos((3pi)/4-x)=-sqrt2 sinx

Prove the following: (cos(pi+x)cos(-x))/(sin (pi-x) cos(pi/2+x))=cot^2x

Prove that : cos (pi/4- theta)cos (pi/4-phi)-sin(pi/4-theta) sin (pi/4-phi)= sin (theta+phi) .

Find the value of sin(pi/4)cos(pi/6) + cos(pi/4)sin(pi/6)

Prove that sin^2(pi/4) + cos^2(pi/6) - tan^2(pi/4) = 1/4

Prove that cos((pi)/(4)+x)+cos((pi)/(4)-x)=sqrt(2)cosx

Prove that following: underset(-pi//2)overset(pi//2)int(2sin |x| + cos|x|)dx

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PSEB-TRIGONOMETRIC FUNCTIONS-EXERCISE
  1. Find the value of : sin 75^@

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  2. Find the value of : tan 15^@

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

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  4. Prove the following: (tan(pi/4+x))/(tan(pi/4-x))=((1+tanx)/(1-tanx))^2

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  5. Prove the following: (cos(pi+x)cos(-x))/(sin (pi-x) cos(pi/2+x))=cot^2...

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

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  7. Prove the following: sin (n + 1)x sin (n + 2)x + cos (n + 1)x cos (n +...

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  8. Prove the following: cos((3pi)/4+x)-cos((3pi)/4-x)=-sqrt2 sinx

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

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

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  11. Prove the following: sin2 x + 2 sin 4x + sin 6x = 4 cos^2 x sin 4x

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  12. Prove the following: cot 4x (sin 5x + sin 3x) = cot x (sin 5x -sin 3x)

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  13. Prove the following: (cos9x -cos5x)/(sin17x-sin3x)=-(sin2x)/(cos10x)

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  14. Prove the following: (sin5x + sin 3x)/(cos5x + cos3x)=tan4x

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  15. Prove the following: (sin x-sin y)/(cosx + cos y)=tanfrac(x-y)(2)

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

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  17. Prove the following: (sin x -sin 3x)/(sin^2 x -cos^2 x)= 2sinx

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  18. Prove the following: (cos4x + cos3x + cos2x)/(sin4x + sin 3x + sin 2x)...

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  19. Prove the following: cot x cot 2x -cot 2x cot 3x -cot 3x cot x = 1

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  20. Prove the following: tan 4x =(4tan x (1-tan^2x))/(1-6 tan^2x + tan^4x)

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