Question
सिद्ध कीजिए कि $\sec \mathrm{A}(1-\sin \mathrm{A})(\sec \mathrm{A}+\tan \mathrm{A})=1 \quad 4$
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| प्राप्तांक $(x_i)$ | $10$ | $20$ | $36$ | $40$ | $50$ | $56$ | $60$ | $70$ | $72$ | $80$ | $88$ | $92$ | $95$ |
| विद्यार्थीयों की संख्या $(f_i)$ | $1$ | $1$ | $3$ | $4$ | $3$ | $2$ | $4$ | $4$ | $1$ | $1$ | $2$ | $3$ | $1$ |