Simplifying Trigonometric Expression without using calculator

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  1. Tambuwal Maths Class
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Why dont you simply use : sin2x=2 sinx cosx as angle is same here?
steps :
sin2x=2 sinx cosx
sinx cosx = (sin2x)/2
here x=11pi/12
2x=11pi/6
sin(11pi/6)/2
= -(sin pi/6)/2
= -1/2/2
= -1/4

sriprasadjoshi
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very nice content..i just want to ask if u may answer please...what software do u use or technology in making this video in the white screen with colored penmanship?

MathTeacherAsh
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Nice application of trig identities. But the calculator is quicker 😉 BTW, you miswrote the cos(x+y) identity.

BartBuzz
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assalamualkum sir how am i supposed to know cos 3pi/4 by heart i know from 0 pi/6 pi/4 pi/3 and pi/2 but i dont know how to find 3pi/4 or 2pi/3 for example

ayanahmed