sin a* tan a /1-cos a = 1+sec a
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Step-by-step explanation:
sin a* tan a /1-cos a
=(sina* sina/cosa)/(1-cosa)
=sin^2a/cosa(1-cosa)
=(1-cos^2a)/cosa(1-cosa)
=(1-cosa)(1+cosa)/cosa(1-cosa)
=(1+cosa)/cosa
=1/cosa +cosa/cosa
=seca+1
=1+seca
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