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Prove the following identities : sec^(...

Prove the following identities :
`sec^(4) A (1 - sin^(4) A) - 2 tan^(2) A = 1`

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ICSE-TRIGONOMETRICAL IDENTITIES-EXERCISE 21 (E)
  1. Prove the following identities : cot^(2) A ((sec A - 1)/(1 + sin A))...

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  2. Prove the following identities : (1 - 2 sin^(2) A)^(2)/(cos^(4) A - ...

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  3. Prove the following identities : sec^(4) A (1 - sin^(4) A) - 2 tan^(...

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  4. Prove the following identities : cosec^(4) A (1 - cos^(4) A) - 2 cot...

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  5. Prove the following identities : (1 + cot A - cosec A) ( 1 + tan A +...

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  6. If sin A + cos A = p and sec A + cosec A = q , then prove that : ...

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  7. If x = a cos theta and y = bcot theta, show that : (a^(2))/(x^(2...

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  8. If sec A + tan A = p, show that : sin A = (p^(2) - 1)/(p^(2) + 1...

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  9. If tan A = n tan B and sin A = m sin B, prove that : cos^(2) A =...

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  10. if 2 sin A - 1 = 0, show that : sin 3 A = 3 sin A - 4 sin^(3) A

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  11. If 4 cos^(2) A - 3 = 0, show that : cos 3 A = 4 cos^(3) A - 3 co...

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  12. Evaluate without using trigonometric tables. 2(("tan" 35^(@))/("cot"...

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  13. Evaluate : sec 26^(@) sin 64^(@) + (cosec 33^(@))/(sec 57^(@))

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  14. Evaluate ( 5 sin 66 ^(@))/( cos 24 ^(@)) -( 2 cot 85^(@))/(tan 5^(@...

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  15. Evaluate cos 40 ^(@) cosec 50 ^(@)+ sin 50 ^(@) sec 40 ^(@)

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  16. Evaluate sin 27 ^(@) sin 63 ^(@) - cos 63^(@) cos 27 ^(@)

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  17. Evaluate : 3(sin 72^(@))/(cos 18^(@))-(sec 32^(@))/(cosec 58^(@))

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  18. Evaluate 3 cos 80 ^(@) cosec 10 ^(@) + 2 cos 59 ^(@) cosec 31 ^(@...

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  19. Evaluate : (cos 75^(@))/ (sin 15^(@)) + (sin 12^(@))/ (cos 78^(@)) -...

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  20. Prove that : tan (55^(@) + x) = cot (35^(@) - x)

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