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Question

In a right angled triangle ABC, $stack C with _ below equals 90 to the power of ring operator end exponent text , end text$ then $cos to the power of 2 end exponent invisible function application A plus cos to the power of 2 end exponent invisible function application B equals$

2
1
$\frac{1}{2}$
$\frac{3}{4}$

The correct answer is: 1

Related Questions to study

If $cos invisible function application theta subscript 1 end subscript plus cos invisible function application theta subscript 2 end subscript plus cos invisible function application theta subscript 3 end subscript plus cos invisible function application theta subscript 4 end subscript plus cos invisible function application theta subscript 5 end subscript equals 5$ then $sin invisible function application theta subscript 1 end subscript plus sin invisible function application theta subscript 2 end subscript plus sin invisible function application theta subscript 3 end subscript plus sin invisible function application theta subscript 4 end subscript plus sin invisible function application theta subscript 5 end subscript equals$

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parallel

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