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Express (cos20^@-cos40^@)in sine form...

Express `(cos20^@-cos40^@)`in sine form

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UNITED BOOK HOUSE-TIRTHAPATI INSTITUTION -EXERCISE
  1. Which is nullest of the following sets

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  2. Express (cos20^@-cos40^@)in sine form

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  3. If i=sqrt-1then which of the follwoings is the value of (1+i+i^2+i^3+i...

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  4. Find the value of discrimimant of the quadratic equation x^2+2x+2=0

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  5. If tan A=3,then which of the followings is the value of tan2A?

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  6. If A={x:x in R,-32lexle10},B={x:x in R,0lexle12}then find A-B.

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  7. If A={x:x in R,-32lexle10},B={x:x in R,0lexle12}then find A-B.

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  8. Determine the modulus-amplitude form of the comples number (sqrt3+i)

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  9. If the sum of the two roots of the quadratic equation x^2-px+q=0be the...

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  10. State the principle of mathematical induction.

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  11. If AsubeBand BsubeCthen show that AsubeC.

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  12. Show that (cos2^@-sin2^@)/(cos2^@+sin2^@)=tan43^@

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  13. If x costheta+ysintheta=xcosphi+ysinphithen show that y=x tan ((theta+...

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  14. IF 2 costheta=x+1/xthen show that 2 cos3 theta=x^3+1/x^3

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  15. Find the value of sin (221//2^@) with the help of the value of cos45^@

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  16. tan25^@=a prove that (tan155^@-tan115^@)/(1+tan155^@.tan115^@)=(1-a^2)...

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  17. Prove that,cos(pi/5)-cos((2pi)/5)=1/2

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  18. By the principle of mathematical induction prove that (5^(2n)-1)is alw...

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  19. IF x=a+bw+cw^2,y=a+bw^2+cwthen show that x^3+y^3=(2a-b-c)(2b-c-a)(2c-a...

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  20. If the roots of the quadratic equation a(b-c)x^2+b(c-a)+c(a-b)=0be eq...

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