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OpenStudy (anonymous):
If cosx=3/5 and 0
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OpenStudy (zzr0ck3r):
Do you know soh cah toa?
OpenStudy (arindameducationusc):
tan 2x= 2tanx/1-tan(^2)a
OpenStudy (arindameducationusc):
tan3x=3tanx=tan^3x/1-3tan^x
OpenStudy (arindameducationusc):
The above was for Question 2
OpenStudy (arindameducationusc):
For Question 1, sinx=1-cos(^2)x and Sin(A-B)=sinAcosB-cosAsinB
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OpenStudy (arindameducationusc):
This was for question1
OpenStudy (anonymous):
It says without using a calculator I know these formulae but I don't think they will be used here Can please solve it detailed Thanks
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