write down at least two examples what might make such a noise
a) hiss
b) rattle
c) thud
d) squawk
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Answer:
c) thud
d) squawk
Hope it helps
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sinA=35, A lies in 1st quadrant.
∴cos2A=1-sin2A=1-(35)2=1625
⇒cosA=45
and tanA=sinAcosA=3545=34
Again cosB=-1213, B lies in 3rd quadrant.
∴sin2B=-513 (In 3rd quadrant, sin is negative)
∴tanB=sinBcosB=-513-1213=512
i) sin(A-B)=sinAcosB-cosAsinB
=35(-1213)-45(-513)
=-36+2065=-1665. Ans.
ii) cos(A-B)=cosA.cosB+sinAsinB
=45(-1213)+35(-513)
=-48-1565=-6365 Ans.
iii) tan(A+B)=tanA+tanB1-tanAtanB
=34+5121-34.512=5633. Ans.
I hope it is clear.
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