Sir,
My doubt is for you, while explaining the first vedio of complementary angles in trigonometry you have solved one question that is express sin81 +cos81 in terms of trigo ratios of angles lying between 0 and 45
the answer is
sin81 + cos81
sin(90-9) + cos(90-9)
=cos9 + sin9
how the solution has came i didn't understand pleae clear my doubt as soon as possible.
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