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I need help with this question

I need help with this question-example-1
User Jeff Bezos
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its t-h
because the sinB = AC/AB (=h) and the cosB= CB/AB but the sinA = CB/AB and the cosA =AC/AB
=> SinB = CosA= t; CosB = sinA=h
=>SinA-CosA = t-h
User MrHus
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