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If cos (67^@30') = x and cosec (22^@30')...

If `cos (67^@30') = x` and `cosec (22^@30') = y` then which is true?

A

`x^2 + y^2 =1`

B

`x^2 - y^2 = 1`

C

x = y

D

xy =1

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UNITED BOOK HOUSE-Trigonometric Ratios of Complementry Angle-Exercise
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  5. (2 tan 30^@)/(1 - tan^2 30^@) is equal to

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  11. (sin^2 1^@ + sin^2 3^@ + sin^2 5^@ + ………………… + sin^2 85^@ + sin^2 87^@...

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  12. The value of (cos(90^@ - theta)sec(90^@ - theta) tan theta)/(cosec(90^...

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  13. The value of (tan 47^@ + cot 27^@)/(tan 43^@ + cot 63^@) is

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  14. (1 + sec 20^@ + cot 70^@) (1 - cosec 20^@ + tan 70^@) equals

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  15. alpha, beta are positive acute angle and sec^2 alpha - cot^2 (beta/2) ...

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  16. ABCD is a cyclic quadrilateral and tan (A/2) tan (C/2) + tan (B/2) tan...

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  17. If cos (67^@30') = x and cosec (22^@30') = y then which is true?

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  18. If cosec 39^@ = x, the value of (1)/(cosec^2 51^@) + sin^2 39^@ + tan^...

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  19. sin^2 5^@+sin^2 10^@ + sin^2 15^@+.........+sin^2 85^@+sin^2 90^@ equa...

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  20. If A, B and C are three angles of a triangle, then the incorrect relat...

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