Question

if 2 sin 2thita = root2 then find the value of cos thita

Answer 1

Answer:

Here's is the answer in the picture . Please refer to it. Thank you.

Answer 2

Answer:

2sin 2∅=\sqrt{2}

then 2(sin∅)=\sqrt{2}

sin∅=\sqrt{2}/2=1/\sqrt{2}

sin∅=1/cos∅

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1/cos∅=1/\sqrt{2}

therefore, cos∅=\sqrt{2}