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Find sin 20^@ -cos 70^@ ....

Find sin `20^@ -cos 70^@` .

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The value of (sin 20^(@) cos 70^(@)+sin70^(@) cos 20^(@) ) is ……….. .

The value of sin20^@ cos70^@+ sin70^@ cos20^@ is: sin20^@ cos70^@+ sin70^@ cos20^@ का मान क्या होगा ?

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The value of (sin 20^(@)cos70^(@)+ cos20^(@)sin70^(@))/(sin23^(@)"cosec"23^(@)+cos23^(@)sec23^(@)) is _________.

sin 70^(@)cos 10^(@) - cos 70^(@) sin 10^(@) = _________

Without using trigonometric tables, show that (cos 70^(@))/( sin 20^(@)) + cos 49^(@) cosec41^(@) = 2

Prove that (i) sin 70^(@) cos 10^(@) -cos 70^(@) sin 10^(@) =(sqrt(3))/(2) (ii) cos 50^(@) cos 10^(@) -sin 50^(@) sin 10^(@) =(1)/(2) (ii) cos 80^(@) cos 20^(@) + sin 80^(@) sin 20^(@) =(1)/(2) (iv) sin 36^(@) cos 9^(@) + cos 36^(@) sin 9^(@) =(1)/(sqrt(3))

Without using trigonometric tables, prove that : (i) sin 43^@cos47^@+cos43^@ sin 47^@=1 (ii) cos 38^@cos 52^@-sin 52^@=0 (iii) sec 50^@sin40^@+cos40^@cosec 50^@=2 (iv) sec 70 ^@sin 20^@-cos 20^@-cosec 70^@=0

NAVNEET PUBLICATION - MAHARASHTRA BOARD-PRACTICE QUESTIONS BASED-TRIGONOMETRY
  1. Fill in the blanks : (i) sin 32^@= cos ……….. (ii) tan 40^@xxtan……...

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  2. if sin^2theta=1/2 ,then find cos^2theta.

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  3. With the help of the given figure , find tan thetaxx tan(90-theta) .

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  4. In the figure , find sin N , cos N, tan W and sin W.

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  5. If cos (40+x)^@ =sin 30^@, find the value of x.

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  6. If sin (A+20)^@ =sqrt(3)/(2) , then find the value of A .

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  7. If sin A cos A =1/2, A is the acute angle , then find the value of A .

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  8. Find the value of sin^2 30^@+cos^2 60^@+tan^2 45^@ .

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  9. Find the value of 2 tan^2 45^@ +cos^2 30^@-sin^2 60^@.

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  10. If sin theta=(11)/(61) then find cos theta.

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  11. If sin theta=(7)/(25) and cos theta=(24)/(25) , then find tan theta.

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  12. Find the value of sin theta xxcos (90-theta) +cos thetaxx sin (90-th...

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  13. Find the value of (cos 56^@)/(sin 34^@) .

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  14. If cos theta=(15)/(17) , then find sin theta .

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  15. Find the value of (tan 60^@)/(sin 60^@ +cos 60^@) .

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  16. If tan theta =1 then find the value of theta and sin theta .

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  17. Find sin 20^@ -cos 70^@ .

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  18. Find the value of (sin 15^@)/(cos 15^@) xxtan 75^@.

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  19. Find the value of sin theta, 6 cos^2 theta =4"" 1/2.

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  20. Find the value of 2sin 30^@ +cos 0^@ +3 sin 90^@ .

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