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Find the value of cos 18^(@)...

Find the value of `cos 18^(@)`

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The correct Answer is:
`(sqrt(10+2sqrt(5)))/(4)`
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SRISIRI PUBLICATION-IPE SCANNER (TEXUAL BITS)-Very Short Questions (2 marks) (Trigonometric Ratios, Transformations)
  1. Find the values of tan 22(1/2)^(@)

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  2. Find the values of sin 36^(@)

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  3. Find the value of cos 18^(@)

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  4. If cos A = sqrt((sqrt(2)+1)/(2sqrt(2))), find the value of cos2A

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  5. IF sintheta=4/5 and theta is not in the first quadrant, find the value...

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  6. If cos theta = t(0lt t lt 1) and theta does not lies in the first qua...

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  7. If cos theta = t(0lt t lt 1) and theta does not lies in the first qua...

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  8. If sin A=(12)/(13), cos B= (3)/(5) and neither A nor B is in the first...

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  9. If 0 lt A, B lt 90^(@), cos A= (5)/(13) and sin B =(4)/(5) then find s...

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  10. If sin =(1)/(sqrt10), sin beta =(1)/(sqrt5) and alpha , beta are acu...

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  11. If cos theta =(-5)/(13) and (pi)/(2) lt theta lt pi , find the value...

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  12. If 0 lt A lt pi //4 and cos A = 4//5, then find the values of sin 2...

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  13. If cos theta =(5)/(13) and 270 ^(@) lt theta lt 360^(@), evaluate sin ...

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  14. If sin alpha =(3)/(5) , where (pi)/(2) lt alpha lt pi , evaluate cos ...

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  15. If cos 0 =(-3)/(5) and pi lt 0 lt (3pi)/(2) , find the value of tan th...

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  16. If 0 lt A lt B lt (pi)/(4) and sin (A+B)=(24)/(25) and cos (A-B)= (4)/...

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  17. If A+B, A are acute angles such that sin (A+B)=(24)/(25) and tan A=(3)...

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  18. If tan (alpha - beta) = 7/24 and tan alpha = 4/3, where alpha , beta a...

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  19. In a Delta ABC, A is obtuse. If sin A=(3)/(5) and sin B=(5)/(13), the...

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  20. If cos A = cos B = -1/2 and A does not lie in the second quadrant and ...

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