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Trignometry

Cool goIITian

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4 Mar 2009 12:13:00 IST

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find the value of sin 7.5

None

find the value of sin 7.5

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manas mahapatra

Cool goIITian

Joined: 21 Feb 2009

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6 Mar 2009 02:02:15 IST

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2sin^2{@/2}= 1-cos 2@, take @ = 7.5, cos 15= [root3+1]divded by 2rt2. get the ans. if undstod pls rate

KAPIL CVS

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20 Mar 2009 21:48:05 IST

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THE VALUE OF SIN(7.5)

revenge

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Joined: 22 Feb 2009

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20 Mar 2009 21:50:21 IST

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its equal to sin 367.5

KAPIL CVS

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20 Mar 2009 21:59:05 IST

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REVENGE,

I THINK UR ALSO OUT OF UR MIN DS . HE ASKED THE VALUE OF SIN (7.5).

NOT AN EQUIVALENNT TRIGO. EQUATION.

THESE SMILEYS SYMBOLISES UR AMBIGUOS ANSWER.

TEJASWI V SHETTY.

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Joined: 15 Feb 2009

Posts: 186

21 Mar 2009 20:33:50 IST

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I AGREE WITH MANAS.

USING D SAME METHOD WHERE @ OF MANAS IS 15, THE ANS U GET IS .

U CAN ALSO USE DOUBLE ANGLE FORMULA OF SIN BUT THAT WILL B MORE LENGTHY.

HOPE U UNDERSTOOD.

KAPIL CVS

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21 Mar 2009 20:40:24 IST

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THE VALUE OF SIN(7.5)

is this answer not correct.

if not, tell where it is wrong.

TEJASWI V SHETTY.

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22 Mar 2009 11:27:41 IST

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i think u hav seen d ans i hav posted earlier for this question which has included d method i hav used.

if u want to know ur fault then plz put the method u hav used in solving this prob...

Sagar Saxena

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23 Mar 2009 08:32:47 IST

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Sin 15⁰ is known.u can get it by applying the formula sin (45⁰ - 30⁰)

u can obtain Sin 7.5⁰ by applying half angle formula in Tan and than convert it into Sin

KAPIL CVS

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24 Mar 2009 17:56:09 IST

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TEJASWI SHETTY,

U WANTED ME TO POST MY SOLUTION.

SIN( @ / 2 ) = [(1 - COS @)/2]^(1/2)

FROM THIS FORMULA,

SIN 15 = SIN ( 30 / 2 )

THEN

SIN (7.5) = SIN ( 15 / 2 )

NOW NOTIFY.?

TEJASWI V SHETTY.

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25 Mar 2009 19:26:06 IST

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kapil cvs,

u r absolutely right in ur approach. Even i used d same method.

i think there is a prob. in ur calculations. check that. i think u would be able to come accross ur mistake.

have a nice day!

aaa

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Joined: 31 Oct 2011

Posts: 1

9 Feb 2012 19:06:11 IST

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thanx

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