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ICSE-TRIGONOMETRICAL IDENTITIES-EXERCISE 21 (C)
- Show that: tan 10^(@)tan 15^(@) tan 75^(@)tan 80^(@)=1
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- Show that: sin 42^(@)sec 48^(@)+cos 42^(@)cosec 48^(@)=2
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- Show that : (sin 26^(@))/ (sec 64^(@)) + (cos 26^(@))/ (cosec 64^(@)...
03:14
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- Express the following in terms of angles between 0^(@) and 45^(@) si...
01:38
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- Express the following in terms of angles between 0^(@) and 45^(@) co...
01:23
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- Express the following in terms of angles between 0^(@) and 45^(@) co...
01:17
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- Prove that : (sin A )/(sin (90^(@) -A)) + (cos A )/( cos (90^(@) - A )...
03:20
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- Show that : sin A cos A - (sin A cos(90^(@) - A) cos A)/ (sec (90^(@...
05:46
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- For triangle ABC, show that : (i) "sin" (A + B)/(2) = "cos" (C)/(2) ...
02:20
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- For triangle ABC, show that "tan"(B+C)/2="cot"A/2
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- Evaluate : 3(sin 72^(@))/(cos 18^(@))-(sec 32^(@))/(cosec 58^(@))
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- Evaluate : 3 cos 80^(@)cosec 10^(@)+2sin 59^(@)sec 31^(@)
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- Evaluate : (sin 80^(@))/(cos 10^(@))+sin 59^(@)sec 31^(@)
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- Evaluate : tan (55^(@)-A)-cot (35^(@)+A)
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- Evaluate : cosec(65^(@)+A)-sec(25^(@)-A)
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- Evaluate : 2 (tan 57^(@))/(cot 33^(@))-(cot 70^(@))/(tan 20^(@))-sqr...
02:15
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- Evaluate : (cot^(2)41^(@))/(tan^(2)49^(@))-2(sin^(2)75^(@))/(cos^(2)...
02:36
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- Evaluate : (cos 70^(@))/(sin 20^(@))+(cos 59^(@))/(sin31^(@))-8sin^(...
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- Evaluate : 14 sin 30^(@)+6cos 60^(@)-5tan 45^(@)
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- A triangle ABC is right angled at B, find the value of (sec A . cose...
04:32
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