what is sinx+cosy if x+y=60
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x+y=60
x=60-y
sinx+cosy
sin(60-y)+cosy
cos{90-(60-y)}+cosy
cos(90-60+y)+cosy
cos(30+y)+cosy
cos30+cosy+cosy
cos30+2cosy
cos(30+cosy)
x=60-y
sinx+cosy
sin(60-y)+cosy
cos{90-(60-y)}+cosy
cos(90-60+y)+cosy
cos(30+y)+cosy
cos30+cosy+cosy
cos30+2cosy
cos(30+cosy)
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