Home
Class 11
MATHS
show that sin 55 ^(@) sin 25^(@) + cos...

show that sin ` 55 ^(@) sin 25^(@) + cos 70^(@) .cos 10 ^(@) =( (sqrt3+1))/( 4)`

Promotional Banner

Topper's Solved these Questions

  • MODEL TEST PAPER 14

    ICSE|Exercise SECTION B|10 Videos

  • MODEL TEST PAPER 14

    ICSE|Exercise SECTION C |10 Videos

  • MODEL TEST PAPER -5

    ICSE|Exercise SECTION -C|10 Videos

  • MODEL TEST PAPER-1

    ICSE|Exercise Section-C|10 Videos

Similar Questions

Explore conceptually related problems

(sin 75^(@) - sin 15 ^(@))/( cos 75^(@) + cos 15 ^(@)) = (1)/(sqrt3)

Show that ( cos 10^(@) + sin 10 ^(@))/( cos 10^(@) - sin 10 ^(@)) = tan 55^(@).

Prove that (sin20^(@) + sin40^(@)) + (cos20^(@) + cos40^(@))=(sqrt(3)+1)cos10^(@)

Show that (1)/(2 sin 10^(@)) - 2 sin 70^(@) =1.

Solve sin^(-1) x - cos^(-1) x = cos ^(-1)(sqrt3/2) .

Show that sin 47^@ + sin 61^@ - sin 11^@ - sin 25^@ = cos 7^@

(1)/(sin 10^(@)) - (sqrt3)/(cos 10 ^(@)) = 4.

Prove that 4(cos ^(3) 10^(@) + sin ^(3) 20^(@)) = 3 ( cos 10^(@) + sin 20^(@)).

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

Show that: sin (40^(@) + theta) cos (10^(@) + theta) -cos(40^(@) + theta) sin (10^(@) + theta) = (1)/(2)