Question

HELP BRO!!! №4!!!!!!!!BROтюни

Answer 1

$frac{cosa+ctga}{1+sina} = frac{cosa + frac{cosa}{sina} }{1+sina} = frac{ frac{sina*cosa+cosa}{sina} }{1+sina} = frac{ frac{cosa(sina+1)}{sina} }{1+sina} = frac{ctga(sina+1)}{(1+sina)}$ $= ctga$