- Maths a level p32 question?

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What is the purpose of blanching foods? Could a black hole exist within the event horizon of a bigger black hole? If 5sinθ = 3 determine the value of:
1. cos (θ-360)
2. Tan (squared)θ
3. Sin θ x cos θ (all divided by cos (squared θ)? Is three days enough to study for a calculous test? I'm trying to find a compound that contains an alkaline earth metal and a polytomic ion and then finding its molar mass.?