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The value of (cos^3 20^@-cos^3 70^@)/(si...

The value of `(cos^3 20^@-cos^3 70^@)/(sin^3 70^@-sin^3 20^@)` is (a) `1/2` (b) `1/(sqrt(2))` (c) 1 (d) `2`

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RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS-All Questions
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  2. The value of cos^2 17^@ - sin^2 73^@ is (a) 1 (b) 1/3 (c) 0 (d) -1

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  3. The value of (cos^3 20^@-cos^3 70^@)/(sin^3 70^@-sin^3 20^@) is (a) 1/...

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  4. If A and B are complementary angles, then (a) sinA=cosB (b) cosA=s...

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  5. If xsin(90^@-theta)cot(90^@-theta)=cos(90^@-theta) , then x=

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  6. If xtan45^@cos60^@=sin60^@cot60^@ , then x is equal to

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  7. If angles A ,\ B ,\ C of a /\A B C form an increasing A P , then sinB=...

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  15. (1-tan^2 45^@)/(1+tan^2 45^@) is equal to

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  18. If A, B and C are interior angles of a triangle ABC, then show that "s...

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