Question

tg^2B(1-sinB)(1+sinB)
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Answer 1

tg²(b) *(1-sinB)(1+sinB)=tg²(b) (1-sin²b)=  tg² (b) -tg² (b)*sin²(b) =tg²b-sin^4b/cos²b = sin²b(cos²b/cos²b)=sin²b