exam Maths Puzzle Numerical Ability

Please help me on my homework

prove the identity

sec^6A-tan^6A=1+3sec^2Atan^2A

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exam Other Question

solve using the addition method
3x+2y=1
5x+3y=3

can you show me how to work this problem out? add or substitute this problem I do not know how or which to do Can you help? 10x+2y=7 y=5x+3