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cos((3pi)/(4)+x)-cos((3pi)/(4)-x) = -sqr...

`cos((3pi)/(4)+x)-cos((3pi)/(4)-x) = -sqrt(2)sinx`

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Prove that: cos((3pi)/(4)+A)-cos((3pi)/(4)-A)=-sqrt(2)sinA

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Prove that: cos(pi/4+A)+cos(pi/4-A)=sqrt(2)cosA

The solution set of "sin" (x - (pi)/(4))-"cos" (x + (3 pi)/(4)) =1 " and " (2 "cos" 7x)/("cos" 3 + "sin" 3) gt 2^("cos" 2x) , is

AAKASH INSTITUTE ENGLISH-TRIGNOMETRIC FUNCTIONS -Try Yourself
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  4. i) If A+B=pi/4 prove that: (cotA-1)(cotB-1)=2 ii) If tan(picosthet...

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  5. Prove that : cos 20^0cos 40^0cos 60^0cos 80^0=1/(16)

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  6. Prove that sin20^(@)sin40^(@)sin80^(@)=(sqrt(3))/(8)

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  7. Prove that : (sinA+sin3A)/(cosA+cos3A)=tan2A

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  8. cos((3pi)/(4)+x)-cos((3pi)/(4)-x) = -sqrt(2)sinx

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  9. Prove that: (a) (sin 2 theta)/(1+cos 2 theta)=tan theta (b) (1+sin ...

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  10. Prove that : cos4x=1-8sin^2xcos^2x

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  11. about to only mathematics

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  12. Find the general values of theta which satisfies the equation tan th...

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  13. Find the general solutions of the following equation: cos theta=-(sqrt...

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  14. In triangleABC, AB=10cm, angleA=45^(@) and angleC=60^(@). Find BC.

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  15. In any triangle, prove that bcosB + c cosC= a cos(B-C).

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  16. In any triangleABC, prove that (sqrt(sinA)-sqrt(sinB))/(sqrt(sinA) + s...

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  17. If the sides of DeltaABC in the ratio 4 : 5 : 6, prove that one angle ...

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  18. यदि triangleABC में (If इन triangleABC), a = (1)/(sqrt(6)-sqrt(2)), b ...

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  19. In any A B C , prove that: 2(b ccosA+c acosB+a bcosC)=a^2+b^2+c^2

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  20. In a A B C , if cosC=(sinA)/(2sinB) , prove that the triangle is isos...

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