Brainliest to best answer!
2 answers:
Personally for proving questions especially trigo, i reckon u memorise all of the formulas, esp double angle and half angle.
also, for other types of proving qn like prove d = 1/2 in an a.p, u can always go back to your basics, which is U1 + d = U2.
but, i would say that as long as u practice a lot of questions u should be able to recognise how to prove the questions
Answer:
take your time and always ask for help when needed
Step-by-step explanation:
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Answer:
4.47
Step-by-step explanation:
3x²+31=91
3x²=91-31
3x²=60
x²=60÷3
x²=20
x=√20
x=4.47
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Step by step explanation:
478.8u^3 should be the answer
