71. The value of the expression:
sin21° + sin211° + sin221° + sin231° + sin241° + sin245° + sin249° + sin259° + sin269° + sin279° + sin289° is?
72. If cos20° = m and cos70° =n, then the value of m2 + n2 is?
73. If $${\text{sin}}\left( {{{90}^ \circ } - \theta } \right)$$ + $${\text{cos}}\theta $$ = $$\sqrt 2 {\text{cos}}\left( {{{90}^ \circ } - \theta } \right){\text{,}}$$ then the value of $${\text{cosec}}\theta $$ is?
74. If $${\text{sin A}} - \cos {\text{A}}$$ = $$\frac{{\sqrt 3 - 1}}{2}{\text{,}}$$ then the value of $${\text{sin A}}.{\text{cosA}}$$ is?
75. If $$\frac{{{{\sec }^2}{{70}^ \circ } - {\text{co}}{{\text{t}}^2}{{20}^ \circ }}}{{2\left( {{\text{cose}}{{\text{c}}^2}{{59}^ \circ } - {{\tan }^2}{{31}^ \circ }} \right)}}$$ = $$\frac{2}{m}{\text{,}}$$ then m is equal to?
76. $$\frac{{{\text{tan}}\theta + \cot \theta }}{{{\text{tan}}\theta - \cot \theta }} = 2,$$ $$\left( {0 \leqslant \theta \leqslant {{90}^ \circ }} \right),$$ then the value of $$\sin \theta $$ is?
77. $$\frac{{\sin \theta + \cos \theta }}{{{\text{sin}}\theta - \cos \theta }} = 3,$$ then the value of $${\sin ^4}\theta - {\text{co}}{{\text{s}}^4}\theta $$ is?
78. If tan15° = 2 - $$\sqrt 3 ,$$ then the value of tan15° cot75° + tan75° cot15° is?
79. If A = tan11°. tan29°, B = 2cot61°. cot79° then -
80. If $${\text{tan}}\left( {\frac{\pi }{2} - \frac{\theta }{2}} \right) = \sqrt 3 $$ the value of cosθ is?
Read More Section(Trigonometry)
Each Section contains maximum 100 MCQs question on Trigonometry. To get more questions visit other sections.