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What can you say about the values of sin...

What can you say about the values of sin A and cos A, as the value of angle A increases from `0^@` to `90^@`?
If `A>B`, then `cos A > cos B`. Is it true?Discuss.

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VGS PUBLICATION-BRILLIANT-TRIGONOMETRY-EXERCISE
  1. Discuss with your friends about the following conditions: sec 0^(@) ...

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  2. What can you say about the values of sin A and cos A, as the value of ...

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  3. What can you say about the values of sin A and cos A, as the value of ...

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  4. If one of the sides and any other part (either an acute angle or any s...

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  5. In Delta ABC , right angle is at B,AB = 5cm and angle ACB =30^(@) De...

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  6. A chord of a circle of radius 6cm is making an angle 60 ^(@) at the ...

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  7. sin (A-B) = 1/2, cos (A+B) = 1/2,0^(0)<A + B <90^(0), A>B అయిన A మరియు...

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  8. Evaluate the following sin 45 ^(@) +cos 45^(@)

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  9. Evaluate the following (cos 45^(@))/( sec 30^(@) +cosec 60^(@))

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  10. Evaluate the following (sin 30^(@) +tan 45^(@) -cosec 60^(@) )/( co...

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  11. Evaluate the following 2 tan ^(2) 45^(@) +cos^(2) 30 ^(@) -sin ^(2)...

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  12. Evaluate the following (sec^(2) 60^(@) -tan ^(2) 60^(@) )/( sin ^(2...

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  13. ( 2tan 30 ^(@) )/( 1+tan ^(2) 45^(@) ) =

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  14. ( 1-tan ^(2) 45^(@) )/( 1+tan ^(2) 45^(@)) =

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  15. (2 tan 30^(@))/( 1-tan ^(2) 30^(@)) =

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  16. Is it right to say that cos ( 60^(@) + 30 ^(@) ) = cos 60^(@) cos 30 ^...

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  17. In right angle triangle Delta PQR ,right angle at Q,PQ = 6cm and angl...

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  18. In Delta XYZ , right angle is at Y,YZ =x, and XZ =2x Then determine an...

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  19. Is it right to say that sin (A+B) =sin A +sin B ? Justify your answer...

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  20. Check and discuss the above relations in the case of angles between 0^...

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