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Evaluate : 2 (tan 57^(@))/(cot 33^(@))...

Evaluate :
`2 (tan 57^(@))/(cot 33^(@))-(cot 70^(@))/(tan 20^(@))-sqrt(2)cos 45^(@)`

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Evaluate: (2 tan 54^(@))/(cot 36^(@))-(cot80^(@))/(tan 10^(@))

Evaluate: (2tan 53^(@))/(cot 37^(@))-(cot 80^(@))/(tan 10^(@))

Evaluate: (2tan 53^(@))/(cot 37^(@))-(cot 80^(@))/(tan 10^(@))

Evaluate: (cot 54^(@))/(tan 36^(@))+(tan 20^(@))/(cot 70^(@))-2

Evaluate : tan 25^(@) tan 65 ^(@) - cot 25^(@) cot 65^(@)

Find the value of : (tan45^(@))/(cosec30^(@))+(sec60^(@))/(cot45^(@))-(5sin90^(@))/(2cos0^(@))

Prove that: (i) cos55^(@)sin 35^(@)+sin 55^(@)cos 35^(@)=1 (ii) (tan 72^(@))/(cot 18^(@))-(cot 72^(@))/(tan18^(@))=0 (iii) sec70^(@)sin 20^(@)+cosec 70^(@)cos 20^(@)=2

Find the value of : (i) (tan 45^(@))/("cosec 30"^(@)) + (sec 60^(@))/(cot 45^(@)) - (5 sin 90^(@))/(2 cos 0^(@)) (ii) 3 sin^(2)30^(@) + 2 tan^(2)60^(@) - 5 cot^(2)45

Without using trigonometric tables , evaluate : ((tan20^(@))/(cosec70^(@)))^(2)+((cot20^(@))/(sec70^(@)))^2+2tan 15^(@)tan37^(@)tan53^(@)tan60^(@)tan75^(@)

Evaluate : 2((cos65^(@))/(sin25^(@)))-(tan20^(@))/(cot70^(@))-sin90^(@)+tan5^(@)tan35^(@)tan60^(@)tan55^(@)tan85^(@)

ICSE-TRIGONOMETRICAL IDENTITIES-EXERCISE 21 (C)
  1. Evaluate : tan (55^(@)-A)-cot (35^(@)+A)

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  2. Evaluate : cosec(65^(@)+A)-sec(25^(@)-A)

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  3. Evaluate : 2 (tan 57^(@))/(cot 33^(@))-(cot 70^(@))/(tan 20^(@))-sqr...

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  4. Evaluate : (cot^(2)41^(@))/(tan^(2)49^(@))-2(sin^(2)75^(@))/(cos^(2)...

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  5. Evaluate : (cos 70^(@))/(sin 20^(@))+(cos 59^(@))/(sin31^(@))-8sin^(...

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  6. Evaluate : 14 sin 30^(@)+6cos 60^(@)-5tan 45^(@)

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  7. A triangle ABC is right angled at B, find the value of (sec A . cose...

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  8. Find (in each case, given below) the value of x, if : sin x = sin 60...

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  9. Find (in each case, given below) the value of x, if : sin x = sin 60...

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  10. Find (in each case, given below) the value of x, if : cos x = cos 60...

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  11. Find (in each case, given below) the value of x, if : tan x = (tan 6...

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  12. Find (in each case, given below) the value of x, if : sin 2 x = 2 si...

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  13. Find (in each case, given below) the value of x, if : sin 3 x = 2 si...

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  14. Find the value of x in the following : cos2x=cos60cos30 + sin60sin3...

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  15. In each case, given below, find the value of angle A, where 0^(@) le...

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  16. In each case, given below, find the value of angle A, where cos (9...

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  17. Prove that : (cos (90^(@) - 0) cos 0) /(cot 0) = 1 - cos^(2) 0

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  18. Prove that : (sin \theta . sin(90^(@) - \theta))/(cot (90^(@) - \t...

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  19. Evaluate : (sin 35^(@) cos 55^(@) + cos 35^(@) sin 55^(@))/ (cosec^(...

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  20. Without using trigonometric tables, evaluate. "sin"^(2)34^(@)+"sin"^...

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