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In the figure, '/\ B=90^circ, /\ C=x^ci...

In the figure,
'/_\ B=90^circ, /_\ C=x^circ'
'/_\ A=y'
'(##VPU_TTT_MAT_X_P01_C05_E14_003_Q01##)'
a) What is 'x+y' ?
b) Prove that 'sin x=' 'cos y'
c) If 'sin x=cos x', find the vạalue of 'x'.

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