plutonium-238
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Can someone please show me how you do question 8b and 10? THANKS!!
Mathematics Cambridge 3u year 11 help exercise 4B (1 Viewer)
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lavender1001
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You'll get an answer if you post the question itself. 
plutonium-238
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OH sorry about that!! 
What happened to the solution I just posted to Q10 at 12:42 ??
Drop a perpendicular from C to PB; call the foot of this perpendicular R
Now note: angle CBR = angle PAB = @
Use this simple fact: in a right-angled triangle, hypotenuse of length 'h' and one acute angle @.
Then the 2 sides, one opp angle @ and the other adjacent to @ have, immediately, resp. lengths:
h sin@ and h cos @
Using this fact: AP = x cos@ and PQ = CR = y sin@
.: AQ = AP + PQ = x cos@+ y sin@
QED
Drop a perpendicular from C to PB; call the foot of this perpendicular R
Now note: angle CBR = angle PAB = @
Use this simple fact: in a right-angled triangle, hypotenuse of length 'h' and one acute angle @.
Then the 2 sides, one opp angle @ and the other adjacent to @ have, immediately, resp. lengths:
h sin@ and h cos @
Using this fact: AP = x cos@ and PQ = CR = y sin@
.: AQ = AP + PQ = x cos@+ y sin@
QED
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