Home
Class 11
MATHS
(a)Derive geometrically that cos(x+y)=co...

(a)Derive geometrically that `cos(x+y)=cos x cos y-sin x sin y`.Hence deduce the valueof `cos 75^@`

Answer

Step by step text solution for (a)Derive geometrically that cos(x+y)=cos x cos y-sin x sin y.Hence deduce the valueof cos 75^@ by MATHS experts to help you in doubts & scoring excellent marks in Class 11 exams.

Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • ANNUAL EXAMINATION QUESTION PAPER - 2018 (NORTH) (WITH ANSWERS)

    SUBHASH PUBLICATION|Exercise Part - C (Answer any Ten questions:)|29 Videos

  • ANNUAL EXAMINATION QUESTION PAPER - 2017 (SOUTH) (WITH ANSWERS)

    SUBHASH PUBLICATION|Exercise Part - E (Answer any One question:)|4 Videos

  • ANNUAL EXAMINATION QUESTION PAPER - 2018 (SOUTH) (WITH ANSWERS)

    SUBHASH PUBLICATION|Exercise Part -D (Answer any One question:)|3 Videos

Similar Questions

Explore conceptually related problems

Prove geometrically that cos (x+y) =cosx cosy +sin x sin y

Prove geometrically that cos(x + y) = cos x cos y - sinx sin y and hence prove cos((pi)/(2) + x) = - sin x .

Knowledge Check

  • If y = cos(log sin x), then dy/dx =

    A
    (-sin (log sin x))
    B
    (-cot x. sin (log (sin x)))
    C
    cot x. sin (log sin x)
    D
    none of these

  • The maximum value of y=a cos x + b sin x is

    A
    ab
    B
    `(1)/(sqrt(a^(2)+b^(2)))`
    C
    `a^(2)+b^(2)`
    D
    `sqrt(a^(2)+b^(2))`

    • Similar Questions

    Explore conceptually related problems

    Prove geometrically that cos (x+y)= cosx.cosy- sinx.siny and hence show that cos2x=cos^2x-sin^2x .

    Prove that geometrically that cos (x+y)= cosx.cosy-sinx.siny and hence show that cos2x=cos^2x-sin^2x .

    Prove geometrically that cos(A+B) = cosA cosB-sinAsinB , hence find cos2A = cos^(2)A-sin^(2)A ?

    Prove Geometrically cos(x+y)=cosx,cosy-sinx.siny and hence prove that cos(x-y)= cosxcosy+sinxsiny using unit circle concept ?

    To cos(A+B)=cosx.cosy - sin x sin "and hence find "cos75^(@)

    If sin x+sin y=3(cos y-cos x) then the value of sin 3 x+sin 3 y=

    Home
    Profile