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Show that: sn10^@+sin20^@+sin40^@+sin50^...

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

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  • MODEL PAPER (2)

    JBD PUBLICATION|Exercise EXERCISE|41 Videos

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Prove the following : sin 10^@ + sin 20^@ + sin 40^@ + sin 50^@ = sin 70^@+ sin 80^@ .

Prove that : sin 12^@ sin48^@ sin 54^@=1/8 .

Prove that : sin 10^@ sin 50^@ sin 60^@sin 70^@= sqrt3/16 .

Show that : cos38^@cos52^@-sin38^@sin52^@=0 .

Show that : cos 38^@ cos 52^@-sin 38^@ sin 52^@ = 0

Prove the following : sin 20^@ sin 40^@ sin 60^@ sin 80^@ = 3/16 .

Prove that : cos 130^@ cos 40^@+ sin 130^@ sin 40^@= 0 .

Prove the following : sin 10^@ sin 30^@ sin 50^@ sin 70^@ = 1/16 .

Prove that : sin 6^@ sin 42^@ sin 66^@ sin 78^@ =1/16 .

Show that |(sin10^@ , - cos10^@),(sin80^@, cos80^@)| = 1

JBD PUBLICATION-MODEL PAPER (3)-EXERCISE
  1. If f(x)=x^2 then find the value of (f(1.1)-f(1))/(1.1-1).

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  2. Find the general solution for each of the following equations: 4 sin^2...

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

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  4. Prove by the principle of mathematical induction: 1+2+3+……..+n<1/8(2n+...

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  5. How many 3-digit even numbers can be made using the digits 1, 2, 3, 4,...

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  6. How many chords can be drawn through 21 points on a circle?

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  7. The sums of n terms of two arithmetic progressions are in the ratio 5n...

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  8. The sum of two numbers is 6 times their G.M. show that numbers are in ...

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  9. Reduce the following equations of the line to slope intercept form and...

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  10. Reduce the following equations of the line to slope intercept form and...

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  11. Reduce the following equations of the line to slope intercept form and...

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  12. Verify that the locus of a point P which moves so that the sum of its ...

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  13. Differetiate the function:[(x+2)(1-3x)]/(2x+1),x ne -1/2 w.r.t.x.

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  14. Letters of the word "EDUCATION" are rearranged. Find the probability t...

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  15. Convert the following in the polar form : (1+7i)/(2-i)^2.

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  16. Solve the following equation :- x^2 + x/sqrt2+1 = 0

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  17. Find all pairs of consecutive even positive integers, both of which ar...

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  18. Solve the inequalities given below:- 7le ((3x+11))/2le11

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  19. Solve the following inequalities: -15 le (3(x-2))/5 le 0

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  20. Evaluate: underset(xrarrsqrt2)lim (x^9-3x^8+x^6-9x^4-4x^2-16x+84)/(x^5...

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