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V PUBLICATION-TRIGNOMETRC FUNCTIONS-QUESTION BANK
- (tan x+tan y)/(1-tanxtany) =……………
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- Show tht tan (x-y)=(tan x-tan y)/(1+tan x tan y)
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- If none of the angles x, y and (x+y) is a multiple of pi, then cot (x+...
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- Show that cot (x-y)=(cot x cot y+1)/(cot y-cot x)
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- Show that cos 2 x=cos ^(2) x-sin ^(2) x=2 cos ^(2) x-1=1-2 sin ^(2) x...
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- Show that sin 2 x=2 sin x cosx=(2 tan x)/(1+tan ^(2) x)
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- Show that tan 2 x=(2 tan x)/(1-tan ^(2) x)
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- Show that sin 3 x=3 sin x-4 sin ^(3) x
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- Show that cos 3 x=4 cos ^(3)x-3 cos x
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- Show that tan 3 x=(3 tan x-tan ^(3) x)/(1-3 tan ^(2) x)
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- Show that (i) cos x+cos y=2 cos (x+y)/(2) cos (x-y)/(2) (ii) cos x-...
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- Prove that (i) 2 cos x cos y=cos (x+y)+cos (x-y) (ii) -2 . sin x s...
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- Find the value of sin 15^@ .
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- Find :the value of 'tan(13pi /12) '.
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- Prove that '(sin (x+y))/(sin (x-y))=(tan x+tan y)/(tan x- ( tany ))'
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- Show that tan '3 x tan 2 x tan x=tan 3 x-tan 2 x-tan x'
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- Prove that cos (pi/4+x)+cos (pi/4- x) = sqrt(2)cos x
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- Prove that (cos 7 x+cos 5 x)/(sin 7 x-sin 5 x)=cot x
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- Prove that (sin 5 x-2 sin 3 x+sin x)/(cos 5 x-cos x)=tan x
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- Prove that sin^2(pi/6)+cos^2(pi/3)-tan^2(pi/4)=-1/2
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