If sin (A – B) = 1 and cos(A + B) = 1, then the value of A and B, respectively are
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Step-by-step explanation:
Molar mass of = 1(S) + 2(O) = 1 (32) + 2 (16) = 32+32 = 64g. 1 mole of substance = Molar mass of the substance. Conclusion: 0.75 moles of have same mass as 3 moles of oxygen.
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Answer:
Answer
Given sin(A+B)=1
⇒sin(A+B)=sin90
o
(∵sin90
o
=1)
⇒A+B=90
o
…………(1)
Again, cos(A−B)=
3
/2
⇒cos(A−B)=cos30
o
(∵cos30
o
=
3
/2)
⇒A−B=30
o
…………(2)
Adding (1)+(2)
A+B+A−B=90
o
+30
o
⇒2A=120
o
⇒A=120/2
⇒A=60
o
Putting A=60
o
in equation-(2) we get
A−B=30
o
⇒60
o
−B=30
o
⇒60
o
−30
o
=B
⇒B=30
o
∴A=60
o
;B=30
o
.
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